Friendfeed aggregates and stores all the activity that is fed into the system. Most FF users bring in their Twitter feed, in effect storing all their tweets. It works a little bit like Google Reader, once it’s there, it will always be there, even if the original is deleted.

The advanced search features of Friendfeed makes it a pretty good twitter search alternative. It even supports real-time, so you can make your own twitter news monitors.

I wrote this for the Online Journalism Blog, read the rest there.