An Australian blogger who analysed the site's use of cookies for over a year suggested that Facebook might still be able to track members' browsing even after they have logged out.
But in a statement to the BBC, Facebook denied any wrongdoing.
"There was no security or privacy breach - Facebook did not store or use any information it should not have," the social network site explained.
"Like every site on the internet that personalises content and tries to provide a secure experience for users, we place cookies on the computer of the user."
Facbeook, of course, recently announced a series of changes to improve the capabilities of the site, with experts suggesting it was a response to Google's launch of a rival social network.
Posted by Andre Dixon
