All the goofy games & people telling the goofiest things to anyone who reads it.
You can block the games easily. Many people don't know that.
Also you can block people so they don't show up on your news feed but you can still visit their page occasionally and they never know the wiser. One might think why be their friend if you block them but I do have a friend who posts alot of anti-Creation and anti-God (the day he posted 17 times in 24 hours I blocked it) I don't mind "visiting" him occasionally and I don't mind when he comments on my stuff but I couldn't deal with all the links and articles he was posting so I blocked him.
You can also block certain people from your own status updates if you wish. I've done that occasionally with political links and articles that I post when I don't feel like a "debate" on my page LOL
Once you get in there and find your way around, you really can control alot of what you see and what others see.
It isn't for everyone though - it is a social sight that's for sure!