Nowadays, if you "Like" something, then that something can pay for the privilege to insert whatever stories it likes into your friends' facebook feeds, under the heading "so-and-so likes such-and-such" followed by your own message. Interestingly the person whose name is being used for the advertisement has no idea what ads are going out under their name.
Two of these in particular show up in my facebook feed several times a week and raise my blood pressure every time they do. One is a particularly annoying evangelical preacher slash motivational speaker who fills up my newsfeed with god-stuff due to the fact that a vague acquaintance I've met a couple of times happens to "like" him. Another is a political thing which fills up my newsfeed with posts I find highly disagreeable under the name of another friend of mine.
What were they thinking? Facebook has designed a feature which makes me hate my friends.