I had the same experience as everyone else before me. I wish I'd paid attention to these reviews on Glassdoor before I spent eight hours perfecting the creative exercise they sent me after the first interview.
A second interview was quickly set up, though, this time it was a video interview over Skype with a community manager in the office I was interviewing for. The interview was very short, with no real substantive questions. I didn't feel like I could give very good answers to the same generic questions without being completely redundant. Interviewer seemed to be in a hurry, so there wasn't very much dialogue.
Two days later, I got a generic email from a recruiter in SF saying they wouldn't be moving forward with my application. Pretty disappointing experience, as seems to be the case with everyone else here.