Hello, As someone who uses tweetdeck,web and my mobile client i would think if there was a way an app would know if the tweet was already seen by a user.One way i could think of is knowing/storing the least tweet (by timestamp) that was fetched by user with API/web, and any app that user will first fetch the last seen tweet time and request only tweet stream after the time.
Has anyone else felt the need for this? Thanks Taggy