Lately I've been somewhat overwhelmed with how many place there are to consume content now online. On a given day I make my way to Google Reader, Twitter, Friendfeed, Tumblr, Facebook, and Yammer all just to read content. Some of it is news, some of it is editorial, some of it is friend content (pictures, videos, etc), some of it is recommended links, etc. And, yeah, there is a lot of overlapping content in all of those places, but there is also a great deal that is unique to the environment. There are hyper-users (I'm one) who post content everywhere, and I'll probably be reading their stuff several times on each stop, but a lot of people have their spot and they stick to it. Also, more interestingly, each place has its own culture and voice. Jump over to Tumblr, for example, and it's mostly people sharing interesting pictures and music a few times a day. Friendfeed, on the other hand, is all about comments and conversation.
I usually find something great in each community that I wouldn't have found anywhere else every time I visit, so I can't stop.