Europe's top Internet security agency, ENISA, has called for new legislation to police social networking sites such as Facebook and MySpace.
"Social networking sites are very useful social tools but we must make recommendations for how to better protect people from the risks these sites create," said Andreas Pirotti, executive director of ENISA (European Network and Information Security Agency).
He suggested that EU legislation be expanded "to cover the taking of photos of people and posting them on the Internet," he said, adding that currently there is no need to get a person's consent in order to post a photo of them.
He also said there is a "crucial need" to raise awareness about how social networking sites work. Few people realise that they can be offered up as friends to people they don't know. Also, many people don't realise that it's almost impossible to erase material once it has appeared on the Internet, Pirotti said.