Facebook Places vs. Foursquare: Who Has the Business Edge?

http://www.pcworld.com/businesscenter/article/203861/facebook_places_vs_foursquare_who_has_the_business_edge.html

參考來源： Facebook Places vs. Foursquare: Who Has the Business Edge? - PCWorld Business Center (在「Google 網頁註解」中檢視)