also i realise that this does not cover 'all social apps' but the foundations of how these social apps are pretty much standard across other applications like kik, firechat, yo, meerkat, periscope, groupme, path, the list goes on. basically just really make sure you understand where that data is going, who can see it, when you post a geo post understand that people know you are at that location, great for digital loyality, maybe not so great for your safety, just be smart - check in when you leave, not when you arrive! :)