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My favourite social network ever was FriendFeed. It had something of this flavour.
Were there aspects of FriendFeed that are no longer available anywhere now?
If I remember, it merged seamlessly hosted conversations and more established RSS content.
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).
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