A friend who's an engineer there passed my resume along. I had two phone interviews, which I found quite difficult. They both had me code on collabedit.org, and the second also actually ran my code on codepad.org – that was a surprise! I did not do perfectly on the phone interview questions, but I still got through.

They brought me on-site for an interview day, which included a tour, lunch, a talk, and four 1:1 interviews. One half of the first interview included some questions about leadership, teamwork, etc., and the rest were all technical. One of the interviewers seemed to be in a grumpy mood, but that's the luck of the draw. The whiteboard coding questions were not too bad, and I think I got them all, though with some silly mistakes along the way. I'd agree with the previous reviewer who said their questions are not as difficult as Google's; though perhaps they therefore have higher expectations as to how quickly or flawlessly you solve them.

On my way out, they gave me a goodie bag with some swag. Oh, and at one point, I saw Zuckerberg milling about.

I got an email a week or so later – I would not be winning the Facebook IPO lottery!

Write a class providing an LRU cache.

3SUM problem.

Open-ended systems/design question on storing and searching zillions of status updates.