The ultimate social app?

I've started using a lot of social websites, first because I thought they might be useful for work, but now I realize they have limited work usage, but are fun and interesting ways to get other perspectives on everything. I started on twitter, then facebook, then myspace, and then plurk. There are lots of other sites: friendster, friendfeed, pownce, bebo, jaiku, ad infinitum. LinkedIn is the most business oriented, but I haven't done any business there. But, I'm sure that is my fault.

I'm not really interested in trying them all. Oh, I signed up for them, cause I could and no one had picked my favorite user name yet, so I thought I should reserve it for the future, just in case...

What I have noticed is that I can spend all of my free time tweeting and plurking and powncing and facing and ...well you get the idea. Not a very useful way to spend the small amount of free time I have.