Some NHL players are worried about the number of people posing as them on the popular social networking site Facebook.

Ottawa Senators forward Mike Fisher says he discovered through friends that someone on Facebook — a website where people set up profiles and exchange messages and photos — was posing as him.

"You know, they were e-mailing people, saying they were me and it wasn't," Fisher said.

A number of other NHL players have also complained that people are subbing for them on Facebook. Senators captain Daniel Alfredsson has several sites as do other players including Toronto Maple Leafs captain Mats Sundin, Calgary Flames captain Jarome Iginla and Flames forward Alex Tanguay.

In Ottawa, academics recently got together to talk about privacy issues and Facebook.

Frank Work, Alberta's privacy commissioner, said he knows all about the site and anyone who is well-known should be proactive when it comes to protecting themselves.

Work says that while there is little threat of a player's personal information getting into the wrong hands, a person's reputation can be harmed by posting messages.

But he added that there's really no legal recourse for Fisher right now. "Unless it's for financial gain, there is nothing illegal about pretending to be someone else on Facebook."