I'm both a friend of the founders and a customer (conference/business user). They're definitely not the kind of people who believe "any publicity is good public

I'm both a friend of the founders and a customer (conference/business user). They're definitely not the kind of people who believe "any publicity is good publicity." That said, they have a wide variety of people using the site, posting everything from soft-porn to serious business decks. While a well-done gag does get you a lot of traffic and attention, it's hard to do it right when you're dealing with such a diverse set of users. They've learnt their lesson.