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College students used to be the exclusive users of the social-networking site Facebook, but now members of the corporate world over age 25 are flocking to the site.

Which raises this question: What should I do if a boss or co-worker tries to add me as a "friend"?

If they accept the request, they could be giving up more personal information than they would ever share at the office. If they don't accept, the boss might be offended. Besides the professional ramifications, being "poked" (the Facebook equivalent of a friendly nudge) by your boss has the potential to ruin the site in the same way that hearing your dad say "bling" instantly made that word's coolness evaporate.

Perhaps sensing that users are struggling with friend requests from bosses and co-workers, Facebook — which has 69 million active users worldwide — rolled out more privacy controls last week that allow users to group their friends into lists and choose how much information the people on those lists can see.

Social-networking sites such as Facebook and MySpace let users create profiles where they post photos, list their hobbies and interact with other users, who can also post items on their profiles.

Besides friends, a Facebook user can see only the profiles of other users in the same "network," which could be based on a school, employer or location. MySpace profiles do not have the same network-based restrictions, but like Facebook, the site does offer privacy controls that let users choose even stricter settings.

Geno Mehalik, 24, a Central Florida hospital employee, said that although he doesn't censor the political views or photos he puts on his Facebook profile, he is careful not to post information that could get him fired.

"I'm unabashedly myself on my Facebook," Mehalik said. "I'm not an idealized, politically correct version of myself."

He just doesn't feel comfortable sharing his whole personality with his boss.

"If you get too buddy-buddy with your superiors, it can screw up the dynamics of the relationship," Mehalik said. "There will always be a gap between who you are at work and who you are at home. But if you have your boss on Facebook, you are putting it all out there."

Mehalik said his boss, who has children his age, is "too professional" to try to add him on a social-networking site. If it did happen, Mehalik said he would tell his boss the request made him uncomfortable.

Because Facebook, MySpace and other social-networking sites are so new, there isn't universally agreed-upon etiquette. One thing many people agree on: It's OK to accept a friend request from a subordinate, but it's not OK to send one to a subordinate.

"That's an intrusion into their lives," said Fred Stutzman, 29, a doctoral student at the University of North Carolina at Chapel Hill who teaches a class on online social networks. "It's like the boss inviting themselves to their subordinate's party."