Social networking sites are used by more than two-thirds of IT professionals on a Network World reader panel, and while personal use of these tools is common, IT professionals spend more time on social networking sites for business reasons than for play.

Slideshow: How IT pros stay on top of game with social networking

LinkedIn is the most popular social networking site, with 41% of IT professionals calling themselves users of the site designed to facilitate business contacts. More than one in five of these IT professionals use MySpace, with similar numbers logging on to Slashdot and Facebook. 

"A lot of these social networking sites, they simplify things I want to do anyway," says Rob Koplowitz, an analyst at Forrester who was apprised of the survey results. "We don't really go to Toastmasters anymore, we have other ways of [networking] and it's far more effective."

The Network World survey about use of social networking sites was conducted last month with 663 IT professionals who read Network World and are members of the magazine's Technology Opinion Panel.

Social networking sites are used by 453 of the 663 respondents, the survey found. Among those 453 users, 68% log on to social networking sites at least once a week, and 16% do so each day. About 18% use the sites once a month, and another 13% visit the sites less frequently.

If anything about the survey results are surprising, it might be the extent to which IT professionals use social networking sites for business purposes. About 42% of the survey's social networking users go to the sites mostly for work. Some 30% use the sites mostly for play, while another 28% split their time on the sites evenly between work and play.

"The interesting thing is they say they're using them for work. That's very cool," says Gartner analyst Tom Austin, who also reviewed the survey results. "That's a perception that's really not out there broadly. I think this data will shock people."

IT professionals who embrace social networking are typically looking to gain business contacts and knowledge about technology, Koplowitz says.

The social networking sites included on the survey were LinkedIn, MySpace, Slashdot, Facebook, Digg, Del.icio.us, Technorati, Stumbleupon, LiveJournal, Reddit, Xanga, Furl, Newsvine and Mixx.