Naw, that ain't right. I saw it on the internet; it must be true. They don't let you put it on the internet if it's not true.
As for Fecebook: Yes, it has a use. Its use is to keep tabs on you, who you associate with, what you say to them, what they say to you, where you shop, what you buy, how you probably vote, who you're sleeping with, and all kinds of other stuff about you. This data is then sold to marketers and other interested parties.
Fecebook users are not the customers, they're the product.