25,000 users are suing Facebook for alleged violations of European Privacy Laws in a class action suit in a Vienna court later today.
The claim was led by Austrian data protection campaigner Max Schrems, and focuses on the way Facebook collects and forwards data. The law graduate wants to stop what he calls a mass surveillance by Facebook.
It has been brought against Facebook's European headquarters in Dublin, which registers all the accounts outside the US and Canada.
More than 900 UK-based users are involved in bringing the case forward and Facebook has not yet made a comment.
The legal action also claims privacy laws are breached in the way the networking giant monitors users when they use the site's 'like' buttons.
Mr Schrems also alleges the company co-operated with Prism, a surveillance system, launched in 2007 by the US National Security Agency.
The case is said to include a compensation claim of about €500 ($539; £362) per person.
Mr Schrems said Facebook does not think the case is admissible under Austrian law.
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