What the heck is location based social networking ???

Do these words Foursquare, Location-based-Service Gowalla, Facebook Places sounds familiar, other than off-course the famous cigarette brand famous in nineties, another crapy_internet_jargon, or facebook_is_facebook_but_whats_this_PLACES_thing  !!!! What else comes to your mind ?????? Well based on my primitive knowledge, I can say, it’s something for people with phones & mobile internet, which can tell their location [...]