1. It should allow you to monitor multiple social media sites easily

2. It should give you the ability to update your stream (add/ remove friends content in your stream)

3. It should allow you to monitor your entire stream as well as create custom sub-streams by filtering/ searching

4. It should provide you with the ability to respond/ comment/ chat.

5. It should provide you with the ability to schedule updates/ schedule retrievals

6. It should provide you with tracking tools, to verify goals and adapt content.

If you know any aggrigators that work like this let me know, I'm always on the hunt for something better. I currently use Tweetdeck and some custom scripts.