I was rapidly becoming sick of Facebook. I only friended people that I'd met before, but even so it was polluted by people who I went to middle school, etc. with who I really didn't know that well even then.
Then I found the "Hide" option. I hide probably 95% of my "friends." After I did this, I LOVED using Facebook again. Every time I logged in, I was able to keep up with good friends of mine who live in other parts of the state, country, world. These are people I DO care about, often talk to in other ways, but it's a nice aggregator. If I post something, everyone that isn't directly relevant to my life can still see and comment on it, but I don't have to see their stuff.
It's perfect, it really revitalized Facebook for me and it's actually FUN to use again.