i find you have more chance with google google has so much out there. there whole business is reliant on the success of other businesses granted they own youtube but there in the search engine game and that will never change. FB on the other hand started as a social network and strives on creating new features and funneling money from businesses and if its another social platform bury it no one does it better than FB. there the worst company known for being greedy so in my opinion if i had to chose marketing a social platform on a search engine is much better than a social platform that sees you as a potential threat thats just my opinion.