Tweetube is a free application that uses your iSight camera to record a 25 second video which is then uploaded automatically to Tweetube. A tweet with an embedded link to the video is sent out, and the world can then see your smiling face.
It's also easy to share YouTube videos with your Twitterpals by logging onto the Tweetube site, and then either entering a YouTube URL or doing a quick search. After you add your tweet, a link is sent off to your Tweeples.
Tweetube received a few seconds of fame earlier this week when comedian Dane Cook recorded a 25-second blast in his usual high-speed rant mode. If you use Twitter, give Tweetube a try!