Facebook's easy connection to friends and family has revolutionized staying in touch, but it also has a dark side.

A just-released Consumer Reports survey shows in the past year more than five million American households experienced problems on Facebook, including virus infections and identity theft.

The same survey also finds one million children were victims of cyberbullying.

Sixteen-year-old Amy Stiefel says she felt terrible after receiving mean posts on her Facebook page.

"I just felt attacked by basically just a whole bunch of people for everyone to see," Stiefel says.

Devastated by the cyberbullying, Amy joined Love Our Children USA, a group that promotes Internet safety.

Many kids are at risk online, according to a survey by Consumer Reports National Research Center of more than 2000 online households.

"We project that more than five million kids age 10 and under had Facebook accounts last year, even though 13 is the minimum age that Facebook allows," says Rosalind Tordesillas of Consumer Reports. "And we found most of their parents did nothing to monitor their Facebook activities."

If you have a preteen using Facebook, be aware parents can delete the account by going to Facebook's "privacy policy" page and clicking on a link to fill out the "report an underage child" form.

"In order to protect your child - whatever their age - it's important to supervise their Facebook use," says Tordesillas. "Become their friend and check their profiles regularly. You can also connect their Facebook account to your e-mail so you see incoming messages."

Facebook users of all ages should use privacy settings, but one in five active members had not used these settings, according to Consumer Reports' survey.

To set them, go into your account's "privacy settings" and indicate "Friends Only."

It's also important to use the privacy settings on the Apps and Websites linked to your account.

"If you connect your Facebook account to another site, you're allowing that site to collect a lot of your personal information unless you block its access," says Tordesillas.

The Consumer Reports survey reveals other troubling facts about Facebook, including almost one in three people have "friends" they are not completely comfortable with - and six percent admitted to having a friend who makes them uncomfortable about their safety or their family's.

Last month, Facebook established new ways to report bullying online. You can report the problem to Facebook, block the person who posted it, or contact help.