Spam, scams and scatterbrains -- the same problems that plagued the old internet are cropping up again in a new wave of technologies known collectively as Web 2.0.

But this time around, proponents say Web 2.0 has been better engineered to withstand the troubles that wrecked Usenet, BBSes and free e-mail.
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Wired News: Web 2.0 Cracks Start to Show