Google has laid a platform of search that we can all build on. Now social is built on search. Add mobile to the equation and you get a great user experience. Add location (geo-location) to mobile and you get Foursquare, Facebook Places.
Now Facebook is becoming a social platform in the way Google is a search platform. People are building on social. My business is now findable on a mobile phone because you are standing near my business location and then you share that with your Facebook friends. Nice.
Today Facebook is doing “Deals” See: