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Tjoon is a site that lets you record split screen videos directly from your webcam. This lets you bypass the need for a video-editing tool or software. Tjoon will automatically detect your webcam, and split your screen four ways. You can fill all the spots yourself, like the guy shown below singing a quartet with himself, or invite friends to join in. There's no real-time collaboration for having your friends participate--you'll need to record a tjoon and then pass it along to your friends for them to then record from their webcam as well.
There are email and embed sharing options for public clips, and users can leave comments and vote thumbs up or down as well. User profiles will display the tjoons they've created, as well as those they've done with other users. The two major limitations for tjoons is the fact that the four-way split screen is the only option (no two- or three-way splits), and you're cut off from recording after only 30 seconds. Other tools for webcam editing tools include vcasmo and Seenly.