If that sounds familiar, you've probably used SoundCloud before. Much like that service's comment system, the Twitch Uploads chatroom ties individual messages to a timestamp, locking them to the moment in the video that the commenter was watching when he sent the message. It's designed to make video comments seem more interactive -- creating a faux-chat that fits in with the existing viewer culture Twitch has cultivated over the years. The feature is being showcased today on specific channels, but will roll out to all users over the next few weeks.