diff --git a/src/DataAccessLayers/BirdsiteLive.DAL.Postgres/DataAccessLayers/TwitterUserPostgresDal.cs b/src/DataAccessLayers/BirdsiteLive.DAL.Postgres/DataAccessLayers/TwitterUserPostgresDal.cs
index edee63d..714eb8f 100644
--- a/src/DataAccessLayers/BirdsiteLive.DAL.Postgres/DataAccessLayers/TwitterUserPostgresDal.cs
+++ b/src/DataAccessLayers/BirdsiteLive.DAL.Postgres/DataAccessLayers/TwitterUserPostgresDal.cs
@@ -5,9 +5,7 @@ using BirdsiteLive.DAL.Contracts;
 using BirdsiteLive.DAL.Models;
 using BirdsiteLive.DAL.Postgres.DataAccessLayers.Base;
 using BirdsiteLive.DAL.Postgres.Settings;
-using BirdsiteLive.DAL.Postgres.Tools;
 using Dapper;
-using Npgsql;
 
 namespace BirdsiteLive.DAL.Postgres.DataAccessLayers
 {
@@ -44,7 +42,7 @@ namespace BirdsiteLive.DAL.Postgres.DataAccessLayers
             {
                 dbConnection.Open();
 
-                var result = (await dbConnection.QueryAsync<SyncTwitterUser>(query, new { acct = acct })).FirstOrDefault();
+                var result = (await dbConnection.QueryAsync<SyncTwitterUser>(query, new { acct })).FirstOrDefault();
                 return result;
             }
         }
@@ -90,7 +88,15 @@ namespace BirdsiteLive.DAL.Postgres.DataAccessLayers
 
         public async Task<SyncTwitterUser[]> GetAllTwitterUsersAsync()
         {
-            throw new NotImplementedException();
+            var query = $"SELECT * FROM {_settings.TwitterUserTableName}";
+
+            using (var dbConnection = Connection)
+            {
+                dbConnection.Open();
+
+                var result = await dbConnection.QueryAsync<SyncTwitterUser>(query);
+                return result.ToArray();
+            }
         }
 
         public async Task UpdateTwitterUserAsync(int id, long lastTweetPostedId, long lastTweetSynchronizedForAllFollowersId, DateTime lastSync)
@@ -112,7 +118,7 @@ namespace BirdsiteLive.DAL.Postgres.DataAccessLayers
 
         public async Task DeleteTwitterUserAsync(string acct)
         {
-            if (acct == default) throw new ArgumentException("acct");
+            if (string.IsNullOrWhiteSpace(acct)) throw new ArgumentException("acct");
 
             acct = acct.ToLowerInvariant();
 
diff --git a/src/Tests/BirdsiteLive.DAL.Postgres.Tests/DataAccessLayers/TwitterUserPostgresDalTests.cs b/src/Tests/BirdsiteLive.DAL.Postgres.Tests/DataAccessLayers/TwitterUserPostgresDalTests.cs
index d71842f..b290735 100644
--- a/src/Tests/BirdsiteLive.DAL.Postgres.Tests/DataAccessLayers/TwitterUserPostgresDalTests.cs
+++ b/src/Tests/BirdsiteLive.DAL.Postgres.Tests/DataAccessLayers/TwitterUserPostgresDalTests.cs
@@ -50,6 +50,24 @@ namespace BirdsiteLive.DAL.Postgres.Tests.DataAccessLayers
             Assert.IsTrue(result.Id > 0);
         }
 
+        [TestMethod]
+        public async Task CreateAndGetUser_byId()
+        {
+            var acct = "myid";
+            var lastTweetId = 1548L;
+
+            var dal = new TwitterUserPostgresDal(_settings);
+
+            await dal.CreateTwitterUserAsync(acct, lastTweetId);
+            var result = await dal.GetTwitterUserAsync(acct);
+            var resultById = await dal.GetTwitterUserAsync(result.Id);
+
+            Assert.AreEqual(acct, resultById.Acct);
+            Assert.AreEqual(lastTweetId, resultById.LastTweetPostedId);
+            Assert.AreEqual(lastTweetId, resultById.LastTweetSynchronizedForAllFollowersId);
+            Assert.AreEqual(result.Id, resultById.Id);
+        }
+
         [TestMethod]
         public async Task CreateUpdateAndGetUser()
         {
@@ -75,6 +93,38 @@ namespace BirdsiteLive.DAL.Postgres.Tests.DataAccessLayers
             Assert.IsTrue(Math.Abs((now.ToUniversalTime() - result.LastSync).Milliseconds) < 100);
         }
 
+        [TestMethod]
+        [ExpectedException(typeof(ArgumentException))]
+        public async Task Update_NoId()
+        {
+            var dal = new TwitterUserPostgresDal(_settings);
+            await dal.UpdateTwitterUserAsync(default, default, default, DateTime.UtcNow);
+        }
+
+        [TestMethod]
+        [ExpectedException(typeof(ArgumentException))]
+        public async Task Update_NoLastTweetPostedId()
+        {
+            var dal = new TwitterUserPostgresDal(_settings);
+            await dal.UpdateTwitterUserAsync(12, default, default, DateTime.UtcNow);
+        }
+
+        [TestMethod]
+        [ExpectedException(typeof(ArgumentException))]
+        public async Task Update_NoLastTweetSynchronizedForAllFollowersId()
+        {
+            var dal = new TwitterUserPostgresDal(_settings);
+            await dal.UpdateTwitterUserAsync(12, 9556, default, DateTime.UtcNow);
+        }
+
+        [TestMethod]
+        [ExpectedException(typeof(ArgumentException))]
+        public async Task Update_NoLastSync()
+        {
+            var dal = new TwitterUserPostgresDal(_settings);
+            await dal.UpdateTwitterUserAsync(12, 9556, 65, default);
+        }
+
         [TestMethod]
         public async Task CreateAndDeleteUser()
         {
@@ -93,7 +143,15 @@ namespace BirdsiteLive.DAL.Postgres.Tests.DataAccessLayers
         }
 
         [TestMethod]
-        public async Task GetAllTwitterUsers()
+        [ExpectedException(typeof(ArgumentException))]
+        public async Task DeleteUser_NotAcct()
+        {
+            var dal = new TwitterUserPostgresDal(_settings);
+            await dal.DeleteTwitterUserAsync(string.Empty);
+        }
+
+        [TestMethod]
+        public async Task GetAllTwitterUsers_Top()
         {
             var dal = new TwitterUserPostgresDal(_settings);
             for (var i = 0; i < 1000; i++)
@@ -147,6 +205,26 @@ namespace BirdsiteLive.DAL.Postgres.Tests.DataAccessLayers
                 Assert.IsTrue(Math.Abs((acc.LastSync - oldest.ToUniversalTime()).TotalMilliseconds) < 1000);
         }
 
+        [TestMethod]
+        public async Task GetAllTwitterUsers()
+        {
+            var dal = new TwitterUserPostgresDal(_settings);
+            for (var i = 0; i < 1000; i++)
+            {
+                var acct = $"myid{i}";
+                var lastTweetId = 1548L;
+
+                await dal.CreateTwitterUserAsync(acct, lastTweetId);
+            }
+
+            var result = await dal.GetAllTwitterUsersAsync();
+            Assert.AreEqual(1000, result.Length);
+            Assert.IsFalse(result[0].Id == default);
+            Assert.IsFalse(result[0].Acct == default);
+            Assert.IsFalse(result[0].LastTweetPostedId == default);
+            Assert.IsFalse(result[0].LastTweetSynchronizedForAllFollowersId == default);
+        }
+
         [TestMethod]
         public async Task CountTwitterUsers()
         {