A Toronto-based law firm with a history of targeting litigation at corporations as varied as chocolate companies and silicone breast implant manufacturers has a new company in the crosshairs: Facebook.

Merchant Law Group, which has offices in 10 Canadian cities, last week launched litigation seeking class action status against the massive social-networking site, alleging the mishandling of sensitive user data--the latest development in a resurgence of action against the social network's privacy policies, after it looked for a while as if all the fuss had calmed down.

The suit alleges that Facebook changed user privacy settings and its terms of service without adequate consent from users, rendering a significant amount of information public to the Web when it had once been protected. The lead plaintiff is a Winnipeg, Manitoba, resident named Donald J. Woligroski, and the complaint alleges that he "has been subject to, inter alia, breach of privacy and the misappropriation of his personal information and, in the addition or alternative, the conversion of said information for commercial use through the materially deceptive conduct of the Defendant"--that defendant being Facebook.