Facebook users are putting themselves at serious risk of identity theft, they were warned today.
Posting just a handful of personal details on the website can give fraudsters all the information they need.
Armed with information found on your Facebook page, they can open bank accounts and credit cards in your name.
BBC1 consumer show Watchdog conducted an experiment by setting up a fictional identity on Facebook.
The Watchdog team created a user called 'Amba Friend', accompanied by a cartoon picture of an attractive girl in her 20s.
'Amba' then contacted 100 people at random inviting them to be her friend.
Despite knowing nothing about the person, 35 of those contacted replied immediately - giving "Amba" and the Watchdog team access to any personal details they shared on the site.
One of them was Scott Gould, 23, from Devon.
His Facebook entry contained his date of birth and home town.
The team used these clues to find more information about Scott on other publicly available internet sites.
They were then able to open an online bank account in his name and successfully apply for a credit card.