Facebook said on Wednesay that the cookies error, which could have been used to track the users after they had logged out of the social-networking site, has been remedied. The cookies error was revealed by Australian blogger Nik Cubrilovic in a blog post earlier in the week.
"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," the company said in a statement. "Three of these cookies on some users' computers inadvertently included unique identifiers when the user had logged out of Facebook."
"We fixed the cookies so that they won't include unique information in the future when people log out," it added.
In a follow up blog post Nik Cubrilovic wrote “My goal was to both identify bugs in the logout process and see that they are fixed, and to communicate with Facebook in getting some of the unanswered questions answered so that the Facebook using public can be informed of how cookies are used on the site - especially with regard to third-party requests.
In summary, Facebook has made changes to the logout process and they have explained each part of the process and the cookies that the site uses in detail.”