Social network aggregation - Now where you are on the web isn’t as important as what you are doing.

http://friendfeed.com/

Sign up for FriendFeed, list the social networks/peer sites you belong to, and it tracks what you are doing on those networks, aggregates it all and provides you and your friends with a personalized feed of the data. That feed can be accessed on the FriendFeed site, or embedded via a widget into another website. (like Elgg)

While FriendFeed will probably become a social network itself, this is a great tool for those niche social networks - like elgg - so Facebook and the other giants don’t have to be everything to everyone!
This is great news - we have been having students arguing with us to "come to their network (facebook)" and not implement Elgg (they having to come to ours). Now they can be everywhere wherever they are - and we can create our elgg social network for continued learning - they can be here, or there and still be apprised of what is going on.