Facebook has contributed to a resurgence in the sexually-transmitted disease syphilis, a health expert has claimed.
Case have increased fourfold in Sunderland, Durham and Teesside, the areas of Britain where Facebook is most popular.
Professor Peter Kelly, director of public health in Teesside, claimed staff had found a link between social networking sites and the spread of the bacteria, especially among young women.
He said: “Syphilis is a devastating disease. Anyone who has unprotected sex with casual partners is at high risk.
"There has been a fourfold increase in the number of syphilis cases detected with more young women being affected.
"I don't get the names of people affected, just figures, and I saw that several of the people had met sexual partners through these sites.
"Social networking sites are making it easier for people to meet up for casual sex."
In Teesside there were 30 recorded cases of syphilis last year, but the true figures are expected to be much higher.
Research has shown that young people in Sunderland, Durham and Teesside were 25 per cent more likely to log onto social networking sites than those in the rest of Britain.
A Facebook spokesman said: “The assertion that Facebook is responsible for the transmission of syphilis is ridiculous. Facebook is no more responsible for STD transmission than newspapers responsible for bad vision. Today’s reports exaggerate the comments made by the professor, and ignore the difference between correlation and causation.
"As Facebook’s more than 400 million users know, our website is not a place to meet people for casual sex – it’s a place for friends, family and co-workers to connect and share.”
