In moments like that I really wish there was a comment from a throwaway account of someone working in Foursquare telling how it looks from the side of the employees.
I'm also happy to answer any questions anyone might have about foursquare culture.
i've worked at high-profile startups with founders who are very media-visible before and dennis is pretty special in my opinion. he seems to genuinely believe that all of us employees are important to making foursquare the best product it can be.
The only negative anyone ever mentioned isn't really a secret, and some people consider it a positive. They have always been pretty open about not wanting to sell the company, which might be great (Facebook was the same way), and is fine if you already have money, but reduces the chances your equity will be worth $100k to $1mm or so; it may increase the expected value (due to a lower probability but huge success event). It does mean the company is less likely to get bought by a company which marginalizes the product and team, too.