You may be right. I never counted nor directly asked, that was just the number I overheard. It felt right; afaik, all of the engineering happened in SF, except one remote office in (IIRC) Germany. I know there were a few companies they had acquired (Eat24 and SeatMe) which remained somewhat isolated from the primary Yelp engineering teams (with their own floors of the building and everything), definitely possible the numbers I heard were not counting them.