Facebook is already being used as a "dating" website by many users.
People meet and talk in IMs.
This is not a fake profile porn oriented dating website. So, I don't see the effect social media has on the "adult dating website" model.
When people want free [I left the word 'want' out above^^] the "adult dating website" model will not be affected. Insecure data retention is adult dating's real downfall
