fascinated listening to orgiin story   great stuff!       i pick up on the idea that the location-sharing apps if you drill down to what they are trying to get at......sharing lived experiences with people in your lives who are not there,   then think how can we do that more effectively........you get Instagram          it's only after you have an Instagram that we realize apps like foursquare were transition tech (like vhs, cds, dvds before streaming for example)       and think about this,  Instagram is not the final evolution of what is possible in sharing lived experiences either and in time something else will come along that does it even better   ;-)