Social networking sites like MySpace and Facebook are dropping the legal hammer on spammers. The question is: Can they really nail the elusive disturbers of Internet peace?

Last week, Facebook’s lawyers at Orrick, Herrington & Sutcliffe filed a lawsuit against Adam Guerbuez, accusing the Canadian man of hijacking users’ accounts, impersonating them to send more than 4 million messages in March and April that market “offensive” and “embarrassing” products such as marijuana and penis enlargement pills.