I always feel the need to stick up for Facebook.
I get the feeling there are a lot of people who like to jump on the the 'Facebook is the cause of all bad in this world' band wagon. For a start, Facebook does not cause problems. Facebook does not have affairs, nor does it get p1ssed and do moronic things on a Friday night nor does it air peoples dirty laundry in a public place - it's the users who do all that.
Secondly, in terms of seeing a load of boring old tosh on there, yes some people do feel the need to share the most mundane points of their day on there but that doesn't mean you have to look at it. It's the same as any other website, like this one. There are frequently posts on here about things that people did/remember, etc 40 years before I was even born and I have no interest in them, so I don't bother looking at them. If you don't like it, then don't look at it.