I gave up on RSS (was using Google Reader), it felt the way an overloaded Inbox feels like.
I use Facebook for interacting with people I know (always entirely social).
Twitter is how I keep up with what's happening. All the news/info I get comes from Twitter. All the sources I had on my RSS reader are also on Twitter. The power of Twitter, for me, is in the links sent and the brief commentary for every link (the micro in micro-blog). Often people won't blog about what they tweet, e.g. the guy who tweeted about meeting an Amazon rep who asked about M-PESA as an alternative payment system. I haven't found any blog post about that, but I saw it on Twitter.
That's the power of having access to a public stream, something neither FB nor RSS allows (you have to explicitly subscribe/friend for information).
Paradoxically, I can handle the volume of tweets more than I can the volume in my feed reader. A good Twitter app (TweetDeck is my currrent favorite) is crucial, I rarely use
twitter.com directly.
Hope that helps.