We're quite pleased to announce that our legendary BlackBook Guide for iPhone -- a free download that lets you browse our 50+ destinations and thousands of listings -- now also comes complete with the first full integration of social media wonderthing Foursquare. Foursquare turns going out into a game. "Check in" at shops, bars, restaurants, or anywhere else, and win points to unlock special badges and special offers. Check in enough times at the same place, and you'll be crowned Mayor. Shame your friends with your newfound baller status! And if you already play Foursquare, no need to switch apps -- check in directly from BlackBook. Of course, all these shenanigans are mere icing on our usual tasty cake of curated shops, bars & clubs, restaurants, and hotels -- not to mention endless special offers by way of BlackBook's own Access Network of cool special perks reserved for our readers. Download now!