I tend to agree with Danah about Orkut. In particular, I think Orkut does not model the real social network of an user. I speak of Orkut because is the buzz of the moment and its being in affiliation with google makes it the big expectation. But the same arguments could be used against many of the social network applications listed on socialsoftwareweblog.
The question is: “Why should I not accept an invitation from a totally unknown user that pretends to be my friend?” There is no negative consequence in adding someone as friend.
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