Teenagers are not reluctant to share private information on social media sites – but often do so only when precautions have been taken, according to a new survey.

Nor are these teens particularly anxious about advertisers or businesses gaining access to their data. Only 9 percent told a recent survey that they were “very” concerned.

The Pew Center survey is also showing that Facebook (News - Alert) is getting a reputation as being less cool than it used to be among teens.

Here are some of the details from the survey: a very high 91 percent of those teens surveyed put a photo of themselves online, compared to 79 percent in 2006. In addition, some 71 percent listed their school’s name, compared to 49 percent in 2006. Seventy-one percent identified the city or town where they live, compared to 61 percent in 2006, and some 53 percent listed their e-mail address online, compared to 29 percent in 2006. Twenty percent listed their cell phone numbers, compared to 2 percent in 2006.

The survey also showed that 60 percent of teenage Facebook users put their Facebook profiles to private, which limits them to just friends.

The survey was conducted by the Pew (News - Alert) Center and the Berkman Center for Internet & Society at Harvard University.

But there is also another interesting trend from the survey: Facebook is considered less cool. Why? Because older adults, such as parents and grandparents, have a presence on the site, too.

There are other concerns voiced by teens about sharing too much information by friends and excessive drama on the site, CNN reported.

Reputation seems to be a large concern for teenagers on Facebook as well.

"The stress of needing to manage their reputation on Facebook also contributes to the lack of enthusiasm," the survey said.

As options, some teens are heading toward Twitter (News - Alert), Tumblr, Instagram, YouTube and Snapchat, CNN reported.

"Those teens who used sites like Twitter and Instagram reported feeling like they could better express themselves on these platforms, where they felt freed from the social expectations and constraints of Facebook," the Pew survey said. "Nevertheless, the site is still where a large amount of socializing takes place, and teens feel they need to stay on Facebook in order to not miss out."

"Facebook's attraction to youth is based in part on being connected, but also on being an 'in group' and 'cool' thing. To the degree that the cool of Facebook wears off, we should see some migration of teens to other platforms," Jeff Hancock, a professor of communications at Cornell University, told CNN. "People are unlikely to fully leave Facebook but simply to diversify their tools for accomplishing social interaction. Instead of Facebook being the Walmart of social media, it will become just one platform in a big ecology, including photo sharing with Instagram, broadcasting with Twitter, etc."

Also, the median teenage Facebook user now has 300 friends, while the typical teenage Twitter user has 79 followers, CNN adds.

Still, the use of social media is not all about friends and popularity. TMCnet reported last year that a survey from World Vision showed more than half of teens surveyed said sites like Facebook and Twitter made them more aware of the needs of others.