It's not force-feeding it to you: there are other places to go. You're a beautiful and unique snowflake who has cool, independent interests. Most people go on the internet to catch up with their friends, and to engage with the same content as them. For many, social media is the watercooler where people talk about the movies or shows they saw last night.
It is a business, and a very profitable one. There are also businesses in helping you discover new and interesting content. For example, StumbleUpon.com.
(One might also argue that BoingBoing is doing just as much force-feeding a specific (and hypocritical) worldview as Facebook, but if one were to argue that their comment would probably be deleted).