I think Facebook is a more fickle platform very dependent on user interaction and participation, if something shinier comes along that connect users more conven

I think Facebook is a more fickle platform very dependent on user interaction and participation, if something shinier comes along that connect users more conveniently than facebook they'd likely be rushing to it. Also there are many who wouldn't mind facebook gone to bury stuff they have done in the past on it. Google has a lot of self-generated value which would take a lot more effort to compete with, as we've seen many google killers have come and gone with claims of superiority only to have their offerings revealed as lacking in comparison. Again if something shinier game along that Google was unequipped to handle, you might see a fork in preferences, and then opportunities for others start to arise.