7. Startup: Path

What it does: Path is a mobile social network that was credited with having the best user-experience among all the social networks on a mobile device.

How much it’s valued at: Anywhere between $100 million and $1 billion.

Tech Giant that could buy it: Dave Morin was offered $100 million by Google even when it was just a fledgling in the stealth mode. That should tell you something about how big it is—but since Facebook’s acquisition of Instagram aimed probably at improving the mobile interface of the social network, it would be a wise move for Facebook to take it out too.