Ogilvy Public Relations has launched The Daily Influence, something they call a social media RSS dashboard. Built on Netvibes, an RSS aggregator (aka newsreader), the site comes standards with pre-selected feeds from popular social media and technology sites.
If you click on different tabs near the top, you'll find different niches.
Hey, Ogilvy - why not add Search Engine Watch to your advertising page? Just sayin'
Anyway, you can sign up and customize the feeds you want to see. If you already have a Netvibes account, you can use it to sign in.
This is probably best for Social Media newbies who just don't know what blogs to follow. Or if you're new to RSS and newsreaders, this might be a good place to start.