Yesterday, Facebook rolled out a new feature to compete with services such as Groupon and Foursquare: Facebook Deals.
For quite some time, you've been able to "check-in" to local businesses on Facebook on the iPhone and (recently) touch.facebook.com. Up until now, Foursquare was still being used five times as much as Facebook Places, even with Facebook's astronomically larger user base. But with the launch of Facebook Deals, that might change.