FriendFeed is a service similar to Twitter, but what it does differently is allow you to add the services you’re using so that they can be aggregated and people can comment on them. Back in the day when everyone was using an RSS reader, and Twitter wasn’t even out yet, if I wanted to track what you were doing on Delicious, Flickr, YouTube, or any other online service, I had to go to each and every one of them manually or subscribe to them via my RSS reader. It made following what a person was doing online a pain in the ass. LinkedUI, as demoed here by Mikko Honkala of Nokia Research Center Helsinki, gives us a demo of what aggregating your friends’ digital footprints could look in future Nokia devices: