Facebook is implementing new ways of detecting account hacking in a bid to stem fraud on the social networking site.
Facebook is working to heighten security and prevent online fraud
Security is being tightened to protect users from hacking and identity theft, a growing problem online.
The secretary general of Interpol revealed last week his Facebook identity had been used by people trying to solicit information on criminals.
Robert K Noble said two fake profiles in his name were discovered and were being used to find out details of the identities of long-term international fugitives being targeted in Operation Infra Red.
Facebook is always working on ways to protect its users from spam and provides people with the tools to keep their accounts safe and secure.Facebook spokesperson
His is the highest-profile case of Facebook fraud so far and served to highlight the security issues surrounding the social network site.
Facebook confirmed it took the security of its users very seriously.
A spokesperson said: "Facebook is always working on ways to protect its users from spam and provides people with the tools to keep their accounts safe and secure."
New measures include security questions for those logging on from unusual places and text and email warnings from Facebook if a new device is used to access the site.
However, one recent measure, which asks users logging on from a new device to name some of their Facebook "friends" based on their profile pictures, has come in for criticism.
Some users have complained that they have many "friends" online who are only acquaintances and that it can sometimes be difficult to immediately identify them from small and poor-quality profile pictures.
The social networking site reached 500 million users in July, of which 26 million are based in the UK.
CEO Mark Zuckerburg has previously admitted the company "missed the mark" when it updated security settings, making them more complicated for users to understand.