i'll buy your "like" for $250,000 (in monopoly money)
So Chase has this "contest going on" where if you get enough likes then you are entered for the "POSSIBILITY" of winning $250,000. Now of course there is more dog and pony with this contest, first you are not guaranteed to be entered if you get enough likes and then it goes in to some other technical contest rules that either i don't care to read or far above my head.
Small businesses often get more excited about contest like this rather then their own brand. Instead constantly asking their friends to "like" or "vote" for them, maybe updating them about a new service or product you have could increase business.
That's my 2 cents (yes, i know it's not worth $250,000 lol)