Keep your friends close and your enemies closer. Although it seems as if Foursquare and Facebook are new bosom buddies now that Foursquare has officially joined the Places parade, along with Yelp , Gowalla and Booyah --- the popular geo-location service is clearly treading carefully. During Wednesday's presentations , many of the partners presented the outlines of comprehensive integration plans. For example, Booyah's CEO Keith Lee announced the launch of InCrowd, a new social game specifically designed to leverage the functionality of Facebook Places. By comparison, Foursquare's presentation was bare bones--- a mere gesture that at some point in the near future Foursquare will find a way to take advantage of Places. The truth is they have no idea how this Places partnership will shake out. After the Places announcement, we sat down with Holger Luedorf , Foursquare's new VP of Mobile, to discuss Foursquare's relationship with Facebook and how they will push ahead with Places. See video ahead.