Facebook has announced the option to pay US$ 7 to promote a post to friends' news feeds. This is nothing to frown upon. Unlike most of FB insidious social graph exploitation and user privacy abuse, this is completely transparent and an entirely legitimate business practice.
It may even be beneficial on the path to monetize the web: Users are getting used to paying for purely digital token services, the next step up for the artificial pigs or whatever crap people buy in Zynga games. The problem of course may be that facebook will have your credit card details and may stealthily or openly start charging for other services.