diff --git a/Socialmetrica.package/TweetsCollection.class/instance/store.st b/Socialmetrica.package/TweetsCollection.class/instance/store.st
index e1be297..623dba7 100644
--- a/Socialmetrica.package/TweetsCollection.class/instance/store.st
+++ b/Socialmetrica.package/TweetsCollection.class/instance/store.st
@@ -2,7 +2,7 @@ accessing
 store
 	ReStore isConnected ifFalse: [ self class storeDB]. "Starting  the ReStore singleton."
 	self tweets do: [:each | 	ReStore evaluateAsTransaction: [  
-			"TO DO: each isNotInDB ->"each store.
-			"TO DO: each user id isInDB? ifFalse: [ each user store ]" 
+			each store.
+			each user isInDB ifFalse: [ each user store ]
 		] 
 	].
\ No newline at end of file
diff --git a/Socialmetrica.package/TwitterUser.class/instance/isInDB.st b/Socialmetrica.package/TwitterUser.class/instance/isInDB.st
new file mode 100644
index 0000000..d533aef
--- /dev/null
+++ b/Socialmetrica.package/TwitterUser.class/instance/isInDB.st
@@ -0,0 +1,7 @@
+accessing
+isInDB
+
+	(TwitterUser storedInstances select: [ :each | each id = self id ])
+		ifEmpty: [ ^ false ]
+		ifNotEmpty: [ ^ true ].
+	
\ No newline at end of file