diff --git a/src/BirdsiteLive.Pipeline/BirdsiteLive.Pipeline.csproj b/src/BirdsiteLive.Pipeline/BirdsiteLive.Pipeline.csproj
index 5f24b03..d1da203 100644
--- a/src/BirdsiteLive.Pipeline/BirdsiteLive.Pipeline.csproj
+++ b/src/BirdsiteLive.Pipeline/BirdsiteLive.Pipeline.csproj
@@ -2,13 +2,16 @@
 
   <PropertyGroup>
     <TargetFramework>netstandard2.0</TargetFramework>
+    <LangVersion>latest</LangVersion>
   </PropertyGroup>
 
   <ItemGroup>
+    <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" Version="1.0.0" />
     <PackageReference Include="System.Threading.Tasks.Dataflow" Version="4.11.1" />
   </ItemGroup>
 
   <ItemGroup>
+    <ProjectReference Include="..\BirdsiteLive.Twitter\BirdsiteLive.Twitter.csproj" />
     <ProjectReference Include="..\DataAccessLayers\BirdsiteLive.DAL\BirdsiteLive.DAL.csproj" />
   </ItemGroup>
 
diff --git a/src/BirdsiteLive.Pipeline/Contracts/IRetrieveFollowersProcessor.cs b/src/BirdsiteLive.Pipeline/Contracts/IRetrieveFollowersProcessor.cs
index 557362f..e0d45dc 100644
--- a/src/BirdsiteLive.Pipeline/Contracts/IRetrieveFollowersProcessor.cs
+++ b/src/BirdsiteLive.Pipeline/Contracts/IRetrieveFollowersProcessor.cs
@@ -8,5 +8,6 @@ namespace BirdsiteLive.Pipeline.Contracts
     public interface IRetrieveFollowersProcessor
     {
         Task<IEnumerable<UserWithTweetsToSync>> ProcessAsync(UserWithTweetsToSync[] userWithTweetsToSyncs, CancellationToken ct);
+        //IAsyncEnumerable<UserWithTweetsToSync> ProcessAsync(UserWithTweetsToSync[] userWithTweetsToSyncs, CancellationToken ct);
     }
 }
\ No newline at end of file
diff --git a/src/BirdsiteLive.Pipeline/Contracts/IRetrieveTwitterAccountsProcessor.cs b/src/BirdsiteLive.Pipeline/Contracts/IRetrieveTwitterAccountsProcessor.cs
index 219f74d..b71ae93 100644
--- a/src/BirdsiteLive.Pipeline/Contracts/IRetrieveTwitterAccountsProcessor.cs
+++ b/src/BirdsiteLive.Pipeline/Contracts/IRetrieveTwitterAccountsProcessor.cs
@@ -1,7 +1,12 @@
-namespace BirdsiteLive.Pipeline.Contracts
+using System.Threading;
+using System.Threading.Tasks;
+using System.Threading.Tasks.Dataflow;
+using BirdsiteLive.DAL.Models;
+
+namespace BirdsiteLive.Pipeline.Contracts
 {
-    public interface IRetrieveTwitterAccountsProcessor
+    public interface IRetrieveTwitterUsersProcessor
     {
-        
+        Task GetTwitterUsersAsync(BufferBlock<SyncTwitterUser[]> twitterUsersBufferBlock, CancellationToken ct);
     }
 }
\ No newline at end of file
diff --git a/src/BirdsiteLive.Pipeline/Processors/RetrieveFollowersProcessor.cs b/src/BirdsiteLive.Pipeline/Processors/RetrieveFollowersProcessor.cs
new file mode 100644
index 0000000..4b2f150
--- /dev/null
+++ b/src/BirdsiteLive.Pipeline/Processors/RetrieveFollowersProcessor.cs
@@ -0,0 +1,33 @@
+using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
+using BirdsiteLive.DAL.Contracts;
+using BirdsiteLive.Pipeline.Contracts;
+using BirdsiteLive.Pipeline.Models;
+
+namespace BirdsiteLive.Pipeline.Processors
+{
+    public class RetrieveFollowersProcessor : IRetrieveFollowersProcessor
+    {
+        private readonly IFollowersDal _followersDal;
+
+        #region Ctor
+        public RetrieveFollowersProcessor(IFollowersDal followersDal)
+        {
+            _followersDal = followersDal;
+        }
+        #endregion
+
+        public async Task<IEnumerable<UserWithTweetsToSync>> ProcessAsync(UserWithTweetsToSync[] userWithTweetsToSyncs, CancellationToken ct)
+        {
+            //TODO multithread this
+            foreach (var user in userWithTweetsToSyncs)
+            {
+                var followers = await _followersDal.GetFollowersAsync(user.User.Id);
+                user.Followers = followers;
+            }
+
+            return userWithTweetsToSyncs;
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/BirdsiteLive.Pipeline/Processors/RetrieveTweetsProcessor.cs b/src/BirdsiteLive.Pipeline/Processors/RetrieveTweetsProcessor.cs
index 46c658e..22416be 100644
--- a/src/BirdsiteLive.Pipeline/Processors/RetrieveTweetsProcessor.cs
+++ b/src/BirdsiteLive.Pipeline/Processors/RetrieveTweetsProcessor.cs
@@ -1,16 +1,65 @@
-using System.Threading;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading;
 using System.Threading.Tasks;
+using BirdsiteLive.DAL.Contracts;
 using BirdsiteLive.DAL.Models;
 using BirdsiteLive.Pipeline.Contracts;
 using BirdsiteLive.Pipeline.Models;
+using BirdsiteLive.Twitter;
+using Tweetinvi.Models;
 
 namespace BirdsiteLive.Pipeline.Processors
 {
     public class RetrieveTweetsProcessor : IRetrieveTweetsProcessor
     {
-        public Task<UserWithTweetsToSync[]> ProcessAsync(SyncTwitterUser[] syncTwitterUsers, CancellationToken ct)
+        private readonly ITwitterService _twitterService;
+        private readonly ITwitterUserDal _twitterUserDal;
+
+        #region Ctor
+        public RetrieveTweetsProcessor(ITwitterService twitterService, ITwitterUserDal twitterUserDal)
         {
-            throw new System.NotImplementedException();
+            _twitterService = twitterService;
+            _twitterUserDal = twitterUserDal;
+        }
+        #endregion
+
+        public async Task<UserWithTweetsToSync[]> ProcessAsync(SyncTwitterUser[] syncTwitterUsers, CancellationToken ct)
+        {
+            var usersWtTweets = new List<UserWithTweetsToSync>();
+
+            //TODO multithread this
+            foreach (var user in syncTwitterUsers)
+            {
+                var tweets = RetrieveNewTweets(user);
+                if (tweets.Length > 0 && user.LastTweetPostedId != -1)
+                {
+                    var userWtTweets = new UserWithTweetsToSync
+                    {
+                        User = user,
+                        Tweets = tweets
+                    };
+                    usersWtTweets.Add(userWtTweets);
+                }
+                else if (tweets.Length > 0 && user.LastTweetPostedId == -1)
+                {
+                    var tweetId = tweets.First().Id;
+                    await _twitterUserDal.UpdateTwitterUserAsync(user.Id, tweetId, tweetId);
+                }
+            }
+
+            return usersWtTweets.ToArray();
+        }
+
+        private ITweet[] RetrieveNewTweets(SyncTwitterUser user)
+        {
+            ITweet[] tweets;
+            if (user.LastTweetPostedId == -1)
+                tweets = _twitterService.GetTimeline(user.Acct, 1);
+            else
+                tweets = _twitterService.GetTimeline(user.Acct, 200, user.LastTweetSynchronizedForAllFollowersId);
+
+            return tweets;
         }
     }
 }
\ No newline at end of file
diff --git a/src/BirdsiteLive.Pipeline/Processors/RetrieveTwitterAccountsProcessor.cs b/src/BirdsiteLive.Pipeline/Processors/RetrieveTwitterAccountsProcessor.cs
new file mode 100644
index 0000000..dcc9d6b
--- /dev/null
+++ b/src/BirdsiteLive.Pipeline/Processors/RetrieveTwitterAccountsProcessor.cs
@@ -0,0 +1,43 @@
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+using System.Threading.Tasks.Dataflow;
+using BirdsiteLive.DAL.Contracts;
+using BirdsiteLive.DAL.Models;
+using BirdsiteLive.Pipeline.Contracts;
+
+namespace BirdsiteLive.Pipeline.Processors
+{
+    public class RetrieveTwitterUsersProcessor : IRetrieveTwitterUsersProcessor
+    {
+        private readonly ITwitterUserDal _twitterUserDal;
+        private const int SyncPeriod = 15; //in minutes
+
+        #region Ctor
+        public RetrieveTwitterUsersProcessor(ITwitterUserDal twitterUserDal)
+        {
+            _twitterUserDal = twitterUserDal;
+        }
+        #endregion
+
+        public async Task GetTwitterUsersAsync(BufferBlock<SyncTwitterUser[]> twitterUsersBufferBlock, CancellationToken ct)
+        {
+            for (;;)
+            {
+                ct.ThrowIfCancellationRequested();
+
+                try
+                {
+                    var users = await _twitterUserDal.GetAllTwitterUsersAsync();
+                    await twitterUsersBufferBlock.SendAsync(users, ct);
+                }
+                catch (Exception e)
+                {
+                    Console.WriteLine(e);
+                }
+
+                await Task.Delay(SyncPeriod * 1000 * 60, ct);
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/BirdsiteLive.Pipeline/Processors/SendTweetsToFollowersProcessor.cs b/src/BirdsiteLive.Pipeline/Processors/SendTweetsToFollowersProcessor.cs
new file mode 100644
index 0000000..51bcb39
--- /dev/null
+++ b/src/BirdsiteLive.Pipeline/Processors/SendTweetsToFollowersProcessor.cs
@@ -0,0 +1,15 @@
+using System.Threading;
+using System.Threading.Tasks;
+using BirdsiteLive.Pipeline.Contracts;
+using BirdsiteLive.Pipeline.Models;
+
+namespace BirdsiteLive.Pipeline.Processors
+{
+    public class SendTweetsToFollowersProcessor : ISendTweetsToFollowersProcessor
+    {
+        public Task ProcessAsync(UserWithTweetsToSync userWithTweetsToSync, CancellationToken ct)
+        {
+            throw new System.NotImplementedException();
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/BirdsiteLive.Pipeline/StatusPublicationPipeline.cs b/src/BirdsiteLive.Pipeline/StatusPublicationPipeline.cs
index d1ddf17..0e0da40 100644
--- a/src/BirdsiteLive.Pipeline/StatusPublicationPipeline.cs
+++ b/src/BirdsiteLive.Pipeline/StatusPublicationPipeline.cs
@@ -15,15 +15,18 @@ namespace BirdsiteLive.Pipeline
 
     public class StatusPublicationPipeline : IStatusPublicationPipeline
     {
-        private readonly IRetrieveTwitterAccountsProcessor _retrieveTwitterAccountsProcessor;
+        private readonly IRetrieveTwitterUsersProcessor _retrieveTwitterAccountsProcessor;
         private readonly IRetrieveTweetsProcessor _retrieveTweetsProcessor;
         private readonly IRetrieveFollowersProcessor _retrieveFollowersProcessor;
         private readonly ISendTweetsToFollowersProcessor _sendTweetsToFollowersProcessor;
         
         #region Ctor
-        public StatusPublicationPipeline(IRetrieveTweetsProcessor retrieveTweetsProcessor)
+        public StatusPublicationPipeline(IRetrieveTweetsProcessor retrieveTweetsProcessor, IRetrieveTwitterUsersProcessor retrieveTwitterAccountsProcessor, IRetrieveFollowersProcessor retrieveFollowersProcessor, ISendTweetsToFollowersProcessor sendTweetsToFollowersProcessor)
         {
             _retrieveTweetsProcessor = retrieveTweetsProcessor;
+            _retrieveTwitterAccountsProcessor = retrieveTwitterAccountsProcessor;
+            _retrieveFollowersProcessor = retrieveFollowersProcessor;
+            _sendTweetsToFollowersProcessor = sendTweetsToFollowersProcessor;
         }
         #endregion
 
@@ -36,12 +39,24 @@ namespace BirdsiteLive.Pipeline
             var retrieveFollowersBlock = new TransformManyBlock<UserWithTweetsToSync[], UserWithTweetsToSync>(async x => await _retrieveFollowersProcessor.ProcessAsync(x, ct));
             var retrieveFollowersBufferBlock = new BufferBlock<UserWithTweetsToSync>(new DataflowBlockOptions { BoundedCapacity = 20, CancellationToken = ct });
             var sendTweetsToFollowersBlock = new ActionBlock<UserWithTweetsToSync>(async x => await _sendTweetsToFollowersProcessor.ProcessAsync(x, ct), new ExecutionDataflowBlockOptions { MaxDegreeOfParallelism = 5, CancellationToken = ct});
-            
+
             // Link pipeline
+            twitterUsersBufferBlock.LinkTo(retrieveTweetsBlock, new DataflowLinkOptions {PropagateCompletion = true});
+            retrieveTweetsBlock.LinkTo(retrieveTweetsBufferBlock);
+            retrieveTweetsBufferBlock.LinkTo(retrieveFollowersBlock);
+            retrieveFollowersBlock.LinkTo(retrieveFollowersBufferBlock);
+            retrieveFollowersBufferBlock.LinkTo(sendTweetsToFollowersBlock);
 
             // Launch twitter user retriever
+            var retrieveTwitterAccountsTask = _retrieveTwitterAccountsProcessor.GetTwitterUsersAsync(twitterUsersBufferBlock, ct);
 
             // Wait
+            await Task.WhenAll(retrieveTwitterAccountsTask, sendTweetsToFollowersBlock.Completion);
+
+            var foreground = Console.ForegroundColor;
+            Console.ForegroundColor = ConsoleColor.Red;
+            Console.WriteLine("An error occured, pipeline stopped");
+            Console.ForegroundColor = foreground;
         }
     }
 }
diff --git a/src/BirdsiteLive.Twitter/TwitterService.cs b/src/BirdsiteLive.Twitter/TwitterService.cs
index 3bec34a..4c8878d 100644
--- a/src/BirdsiteLive.Twitter/TwitterService.cs
+++ b/src/BirdsiteLive.Twitter/TwitterService.cs
@@ -1,9 +1,12 @@
 using System;
+using System.Collections.Generic;
+using System.Linq;
 using System.Threading.Tasks;
 using BirdsiteLive.Common.Settings;
 using BirdsiteLive.Twitter.Models;
 using Tweetinvi;
 using Tweetinvi.Models;
+using Tweetinvi.Parameters;
 
 namespace BirdsiteLive.Twitter
 {
@@ -11,6 +14,7 @@ namespace BirdsiteLive.Twitter
     {
         TwitterUser GetUser(string username);
         ITweet GetTweet(long statusId);
+        ITweet[] GetTimeline(string username, int nberTweets, long fromTweetId = -1);
     }
 
     public class TwitterService : ITwitterService
@@ -21,13 +25,13 @@ namespace BirdsiteLive.Twitter
         public TwitterService(TwitterSettings settings)
         {
             _settings = settings;
+            Auth.SetApplicationOnlyCredentials(_settings.ConsumerKey, _settings.ConsumerSecret, true);
         }
         #endregion
 
         public TwitterUser GetUser(string username)
         {
-            //Auth.SetUserCredentials(_settings.ConsumerKey, _settings.ConsumerSecret, _settings.AccessToken, _settings.AccessTokenSecret);
-            Auth.SetApplicationOnlyCredentials(_settings.ConsumerKey, _settings.ConsumerSecret, true);
+            //Auth.SetApplicationOnlyCredentials(_settings.ConsumerKey, _settings.ConsumerSecret, true);
             var user = User.GetUserFromScreenName(username);
             if (user == null) return null;
 
@@ -45,9 +49,36 @@ namespace BirdsiteLive.Twitter
 
         public ITweet GetTweet(long statusId)
         {
-            Auth.SetApplicationOnlyCredentials(_settings.ConsumerKey, _settings.ConsumerSecret, true);
+            //Auth.SetApplicationOnlyCredentials(_settings.ConsumerKey, _settings.ConsumerSecret, true);
             var tweet = Tweet.GetTweet(statusId);
             return tweet;
         }
+
+        public ITweet[] GetTimeline(string username, int nberTweets, long fromTweetId = -1)
+        {
+            //Auth.SetApplicationOnlyCredentials(_settings.ConsumerKey, _settings.ConsumerSecret, true);
+            TweetinviConfig.CurrentThreadSettings.TweetMode = TweetMode.Extended;
+
+            var user = User.GetUserFromScreenName(username);
+            var tweets = new List<ITweet>();
+            if (fromTweetId == -1)
+            {
+                var timeline = Timeline.GetUserTimeline(user.Id, nberTweets);
+                if (timeline != null) tweets.AddRange(timeline);
+            }
+            else
+            {
+                var timelineRequestParameters = new UserTimelineParameters
+                {
+                    SinceId = fromTweetId,
+                    MaximumNumberOfTweetsToRetrieve = nberTweets
+                };
+                var timeline = Timeline.GetUserTimeline(user.Id, timelineRequestParameters);
+                if (timeline != null) tweets.AddRange(timeline);
+            }
+
+            return tweets.ToArray();
+            //return tweets.Where(x => returnReplies || string.IsNullOrWhiteSpace(x.InReplyToScreenName)).ToArray();
+        }
     }
 }