Some of you I've noticed are using Twitter with some success. I've noticed a few other sites push toward FriendFeed.
FriendFeed is a social aggregation tool, does a very good job of pulling together all of the social feeds from quite a few sources (Picasa, Flickr, Del.icio.us, Facebook, YouTube, BlogSpot and more).
The very nice part about it is you are subscribing to me without actually knowing what services I use. However FriendFeed aggregates the things I do and puts them into an RSS feed / page you can keep up to date with.
I've used it to tag a few services I use and have created a profile for you to also tag and watch if you want. From that, you can separately drill into the social sites I use.
Well worth a look if you want to follow someone or be followed.