Facebook, which is being used by tens of millions of people, could be threatened of security issues with some of the site’s applications.

As per a report in The Wall Street Journal, Facebook’s ten most famous applications have been employed by dozens of advertising and Internet tracking Companies to access to personal information stored on them. One such app is Zynga's popular social game FarmVille, which is played by around 56 million people who are at risk of security breach.

But, Facebook have declined to back the report’s findings and it stated that there were no proofs of any exploitation or stealing of information.

“It has taken immediate action to disable applications that violated terms of its privacy policy”, says Company. It is also finding technical solutions and would reveal the details in coming days.

The Journal’s report included that each Facebook user has unique identity that could be used as referers by many websites to refer to other sites to disclose the details of users.

The fault lies in the designing of the internet and not Facebook is culprit for the privacy violations, says privacy advocates and legal experts. But, still the leakage of information shakes the trust of Facebook users.

Facebook should initiate a strict authentication process for third-party applications, as recommended by Chester Wisniewski, Senior Security Adviser at Sophos.