
I agree with Spyros, I have a lot of friends (real ones almost entirely) on Facebook but I don't spend nearly enough time there to keep up with all the stuff they post. And the Facebook applications mostly drive me mad with their inane and persistent in-your-faceness. I always click the 'Ignore this request' button with a slightly guilty feeling of having 'jilted' someone I care about.
And I agree with his remarks about Twitter too. It took me a long, long time to understand it, but now that I do I'm beginning to appreciate it. I also use Friendfeed - a lot. If you want to see how, just visit my stream.
You'll notice it contains posts from Twitter, Delicious, Moblog and many more. All of them are added automatically whenever I post to those sites. And when I write an item on my blog Friendfeed picks that up and adds it for me too along with all those other sources. And I can fill in my 'status' on Friendfeed just as I would on Facebook or Twitter. All the output from Friendfeed can appear in Facebook, Twitter, and anywhere else I like without me lifting a finger or striking a key. I love it!
It's well worth a try. Like Twitter it's really simple and very easy to use.