Every place full of ambitious people is full of liars, but I've lived in several such places and overall the ratio of lying to ambition here is lower than anywhere else I've found. There are a lot more posers in New York and LA and Cambridge than there are in SV.
LA Poser: Lies about being friends with celebrities, deals they're working on, movies they're making etc
Cambridge poser: ??? How many books they've read? How many ancestors came over on the Mayflower?