A majority of Facebook users say they connect to the social networking site from work, but 73 percent have not "friended" their boss, according to a new report from F-Secure.

More than half (58%) of Facebook users said they visit the site at least occasionally at work and 77 percent report they actively use the privacy settings on the site.

"We're finding that Facebook users are more privacy savvy than some experts assume," said Sean Sullivan, F-Secure Security Advisor.

"As Facebook moves to make more and more information public, its users seem to be increasingly aware that their privacy control is at stake."

More than a third (35%) of Facebook users said they have posted something on the site they later regretted.

In addition, Facebook users are careful about backing up photos they post on the site. Seventy percent said they have backups of at least some of the photos they've shared, compared to 56 percent of computer users who stored or backed up their digital photos in a 2009 survey by F-Secure.

"Facebook is a free service," Sullivan says, "but we 'pay' by viewing advertising and making our lives into content that can be searched, shared and monetized."

"Users are willing to make a bargain, but they are also demanding Facebook for more control over what they share and with whom."