Then there are the startups trying to crack the social video and voice nut. Playkast lets users embed videos on their site or Facebook page. Stroome lets content creators edit, share and remix each other's content. Qwip is a social network of voice messages.

Voice in particular hasn't caught on in the social networking scene, panelists say. On the creation front, it's often awkward recording your voice. On the consumption side, it's faster checking a written status update over a voice one.

"There's a reason voicemail is kinda going away," says Mitch Lasky, general partner at Benchmark Capital.

Venture capitalists sitting on panels and analyzing presentations gravitated toward social network services and analytics companies, giving them the best odds of making money out of the gate.

To this end, a host of companies presented analytics services, such as Honeylizer, Socialbakers and Voyurl.