1. Facebook ads, audience targeting.
https://www.facebook.com/help/229438340403916
2. Google mobile maps.
http://www.google.com/mobile/maps/
3. GroupOn Now! deals available on Foursquare.
https://blog.groupon.com/cities/groupon-now-deals-available-in-foursquare/
4. Yelp academic dataset.
http://www.yelp.com/dataset_challenge/
5. Armenatzoglou, N., Papadopoulos, S., Papadias, D.: A general framework for geo-social query processing. Proc. VLDB Endow. 6(10), 913–924 (2013)