Fever had something like that, unfortunately it's not available any more as an RSS provider. Not sure if there are any other solutions, maybe even self-hosted that aggregate content.

I'm currently using http://nuzzel.com/ to aggregate my Twitter, Facebook and Linkedin feed and it does a great job of filtering out the "important" stuff that people talk about. Not just the noise that comes and goes.

I'm really happy with it, so happy that I even activated the email digest every morning and push notifications. It's pretty neat if you don't want to be drowned in a stream of information but also want to know what's going on.