A lot of book publishers now use facebook likes as a way of determining whether to buy manuscripts from specific authors--which is ridiculous because of things like fivver. I've studied this stuff for a while--I'm a bit dubious in that regard-- to see how such things can be exploited for benefit and it's a tremendous span--so many industries are trying to be web savvy and latching onto things like likes and views, and favourites--but all of these are as demonstrated in this post are fairly easily exploitable.