An article on the wired suggests that besides scalability, AJAX was the major culprit behind Frienster flop

clipped from www.wired.com

Abrams: Of course. Another thing is that I think some of the ways people are using Ajax now actually makes the user experience worse, rather than better. There are so many sites where you click on something and they use that thing where the background fades and then this window pops up in a sort of modal dialog, and it's completely intrusive. It poses an unnecessary delay, because you have to wait for this animation to happen that really adds no real value. It's just a trendy Ajax effect that everybody seems to be copying from each other. And, you know, that's not what our style is.

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