Here's the deal with this, it's not just Foursquare. Facebook place pages now link to their counterparts on Foursquare, Yelp, SCVNGR, and Gowalla. This is what's happening here. When users first checked in on Foursquare, Gowalla, etc. and pushed those check-ins to Facebook, Facebook created a new place page specifically to capture the checkins pushed in for that location from that platform. Now that Facebook has made it easier for users to merge duplicate place pages, those duplicate platform-specific place pages are being merged together into one Facebook page. This page then captures not only Facebook checkins, but all of the checkins from other platforms that are pushed to Facebook (it will not capture check-ins that are not pushed to FB). It's not a new feature. It's just a result of the merging of the various pages created by check-ins pushed to Facebook. We're working with these pages every day at MomentFeed and have been watching this happen for several weeks now.