FriendFeed may well have cracked the nexus requirement for social network feed updates. It has an excellent and easy to use setting to publish updates to Twitter. After setting up which sites you want to automatically publish to Twitter, you simply go ahead and make posts wherever you are, and the Twitter post is done for you.
This way I can add a bookmark to delicious.com/nzmark and tweet it all in one action. FriendFeed conveniently shortens the URLs with its own URL shortening domain -- I didn't see the setting there to use a shortener (I normally use bit.ly as I like the way you can define your own short URN) but it was a nice touch that they didn't make me set it up myself.
Now if only there was a nice Android-optimised interface to go along with the iPhone one...

