TORONTO - Facebook could find itself with far fewer friends today.

That's because tens of thousands of users have pledged to log off the social networking site for good as part of Quit Facebook Day.

The idea was the brainchild of Canadians Joseph Dee and Matthew Milan.

The Toronto duo launched Quit-Facebook-Day-dot-com several weeks ago to announce their plans to leave the site.

Dee and Milan say they are concerned with how Facebook manages the personal data of its more than 400 million users -- including 15 million in Canada.

Facebook has been in the hot seat over privacy on the site.

Complaints have emerged over default privacy settings that were exposing more information than some users were aware of.

Facebook founder Mark Zuckerberg recently announced a single-click option for users to determine whether they'll share their information with friends or with everyone.

The new settings will also allow users to stop third parties from accessing their personal information.