Apart from the costs of it all, what is interesting is the fact that the attack against one person/entity triggered problems for everybody else using the services of Twitter, Facebook and Google. The collateral effects are damning.
Blogger targeted in Twitter, Facebook DoS (ZDnet.co.uk, 7 August 2009) and Cyberattack That Brought Down Twitter & Facebook Only Highlighted The Guy It Hoped To Silence (TechDirt, 10 August 2009)
French version: Twitter rendu indisponible par une attaque visant un internaute (JDN, 7 August 2009)
Facts of 2nd attacks: