facebook or most of the things in the internet where you log yourself into can capture your "likes"...say you like a band of beer or wine the first time, it is programmed to put more info or "adverts" on your page similar to the product that your first "liked"...if you put avid football fan as your hobby...then it will send you more info about football..et al...if your friends "liked" alcohol then it will show on your feed as well...so basically what you info you feed your facebook page will send you things that are likely similar...you may want to "unllike" them so it doesnt show on your feed anymore, but then again it will show on the right hand side of your page if your friends keep "liking" them still.
