Actually I'd say facebook is nothing like Apple or Google, which is why it's vulnerable. While both Apple and Google benefit from some network effects, both of

Actually I'd say facebook is nothing like Apple or Google, which is why it's vulnerable. While both Apple and Google benefit from some network effects, both of 'em have a huge technical lead over the competition in their areas of expertise. Facebook, though, is all about network effects, so they're much more susceptible to being overtaken by the next big thing.