Regarding the latter question, IMO, the technological cat is out of the bag: we live in an era of global fast communication infrastructure. If those sites ceas

Regarding the latter question, IMO, the technological cat is out of the bag: we live in an era of global fast communication infrastructure. If those sites ceased to exist tomorrow, some other mechanism would quickly spring up to fill the void. People want those sites so it's people and culture that needs to be changed.