Anything designed to trick folks, especially Google, is black hat even if it has not been picked up yet. If you adopt any of them early on you might get some good results, temporarily. But like paid links that helped early users for a while, as soon as the search engine people caught on and started penalizing them for it they went into the toilet!I know that there are some scripts out there to Make the user automatically like you on facebook once you visit their website. But is it infact a "Black Hat" way of getting it?
Better to think of legitimate ways to get the likes.