They say great ideas come from solving everyday problems. For Keith Rabois, that problem was buying an entire home online within "a few clicks." This was such a relatable issue that OpenDoor, an eBay for homes, just raised "an insane party round" from "everyone" in Silicon Valley.

The anonymous app Secret is good for bragging about polyamorous deviances, lifting the veil on #crushit culture, and now getting a job with a powerful venture capitalist.