Facebook is set to be investigated by the privacy regulator in Ireland related to concerns over how it handles European users’ data. Meanwhile, the U.S. Federal Trade Commission (FTC) is facing calls to probe Facebook over recent privacy concerns.

The social network has come under fire this week after it was claimed that it tracks your Web browsing activity even after you have logged out. Facebook claims that it has now fixed the issue (the tracking cookies are disabled after you log out), but concerns over how the social network handles privacy remain.

In the next 2 weeks, the data protection commissioner in Ireland will launch a privacy probe into Facebook on behalf of 27 European states. A report on the audit is expected to be completed before the end of the year, according to the Guardian.

A spokesperson for the Irish data protection commissioner said that the Facebook audit would the the agency’s most intensive probe to date. The investigation was launched after the Irish regulator received 22 complaints from Europe versus Facebook between mid-August and Sept. 19. Many of those complaints centered on the way in which Facebook retains data about its users, such as concerns about how the social network does not delete data that users have removed from their profiles and issues related to Facebook’s facial recognition technology. The investigation will take place at Facebook’s European headquarters in Dublin next month.

A Facebook spokesperson said that its Dublin offices manage the social network’s compliance with European Union data protection laws. The spokesperson added, “We are in regular dialogue with the Irish data protection commissioner and we look forward to demonstrating our commitment to the appropriate handling of user data as part of this routine audit.”

On the other side of the Atlantic, Representatives Ed Markey (D-Mass.) and Joe Barton (R-Texas) — co-chairs of the Congressional Bi-Partisan Privacy Caucus — have asked the FTC to investigate the issue of tracking cookies. In a letter to FTC Chairman Jon Leibowitz, they claim that Facebook users should not be tracked without their permission and that tracking user behavior “raises serious privacy concerns.”

Several other privacy watchdog groups — including the Electronic Privacy Information Center, the American Civil Liberties Union and the Center for Digital Democracy — have encouraged the FTC to investigate Facebook over Open Graph and the new ticker feature, which encourage users to share more information about themselves and what they do online on the social network.

This is not the first time that Facebook has come under investigation over privacy issues. Earlier this year, it was investigated by U.K. and Irish data protection officials over its facial recognition system. Concerns over the system, which offers suggestions of people to tag in newly uploaded photos, were also expressed by George Jepsen, attorney general of Connecticut, who later met with Facebook over his letter (the social network made it easier to opt-out of using the system at this point).

Facebook also came under fire from data protection officials in Germany over the facial recognition feature, who demanded that all data Facebook had collected on users in the country using the system was deleted. Germany has a history of issues with Facebook, with concerns being raised over parties organized on the social network, along with Facebook pages and the Like button. Facebook has since agreed to a voluntary code of conduct with Germany that will help protect user data in the country.