Which Bay Area startup is the most exciting?
I've just decided to leave my startup, and am thinking about where to go next. As part of that, I'm trying to figure out which startups in the Bay Area seem the most interesting, exciting, and disruptive.
7 years ago it seemed obvious to me that the answer to that question was Facebook, but now it's less than clear. So I figure perhaps HN can help - what do you think is the most exciting startup in the Bay Area, and why?
(As a guide, perhaps let's define a "startup" as having less than 50 employees and being less than 3 years old.)