What's the Next Instagram?

For many, the answer is video. Apps like Viddy and Socialcam have picked up steam, gaining users—including pop stars Justin Bieber and Britney Spears—who are shooting and sharing videos with others within the apps and on social networks. Like Instagram, many of these apps also include a number of effects you can use to give your videos an edge, such as filters and background music.

And with the upcoming unveiling of Airtime, a stealth social video startup from Napster cofounders Shawn Fanning and Sean Parker, it's clear that the medium is on the rise.

With this in mind, I reviewed a number of quickly growing video-sharing apps. All are free and let you share your creations with friends in several different ways. Odds are slim you'll use one of these to create a prize-winning film, but chances are you'll have fun developing your inner auteur.