Do you aggregate your social networks/what do you use?
access_denied: What I do: browser bookmarks + regular calendar reminders "should I visit network xyz?".  (No email notifications or anything.)If I could design a service...
It would pick the _type_ of new stuff of each network of my choosing and aggregate like a Feedreader.  With type I mean for example: new entries on my wall in a given Ning community, but no personal messages and aggregate those together with friend requests on Facebook.