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Were there aspects of FriendFeed that are no longer available anywhere now?
I suspect the most important is that the creators (Paul Bucheit, Bret Taylor et al) were highly active users who understood their own site. Not true of Twitter or Facebook AFAICT. It meant lots of features of FF seemed tuned really well.
Eg all the character limits were just right - enough for nuanched, thoughtful discussion. Certain kinds of threading was designed in from the start. So was federation (of blog content, delicious, flickr, and other sources).
The basic object was people's personal feeds, but FF added a "room" feature, around shared interests. Many of these worked extremely well. The best open science discussion for many years was in several of those rooms.
Facebook added many of these ideas (inc. the like button) after acquiring FriendFeed, but none of them ever seemed to work quite as well there; lots of details aren't quite right. In some ways it seems like a watered-down, rather more cumbersome and clunky version of FriendFeed.
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