A site that visibly promotes how many ’friends’ you have turns friends into commodities, creating an economy where you are motivated to make as many friends as you can. That’s not a good idea because the utility of these sites suffer as social networks become too densely populated.
Kevin Fox of Gmail & FriendFeed on User Experience Design (via Rebecca Cottrell)
Tumblr isn’t so good with a bunch of text.
I moved my responce here: The art and science of social software
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