O'Reilly Network: What Is Web 2.0 The bursting of the dot-com bubble in the fall of 2001 marked a turning point for the web. Many people concluded that the web was overhyped, when in fact bubbles and consequent shakeouts appear to be a common feature of all technological revolutions. Shak in Public bookmarkswith 2.0folksonomyweb2.0by 14 users