I love twitter, but if that's all I was getting from it, I wouldn't use it if they paid me. Why do you bother following sources who show you a lot of stuff you don't like?
1) I don't know of any source that likes exactly the same things as I do. Think venn diagrams.
2) It's very easy to skim over the things that aren't interesting. I usually see tweets through flipboard and it's like a magazine. I scan for interesting things, and skip most of it.
This is the only way I know how to get the variety I want. I've thought about writing a statistical classifier to filter out a lot of it. I should get off my ass and do that.