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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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