Facebook is being sued over allegations it has been scanning your private inbox for information to send to advertisers.
According to the Daily Mail, the site is accused of monitoring messages and website links so they can charge for information.
Google, Yahoo! and LinkedIn are among six companies facing accusations of intercepting communications for profit in a lawsuit in the US.
Matthew Campbell and Michael Hurley are seeking compensation of £60 for each day the practice has occurred or £6,000 for each of the US users who has had messages intercepted.
The case only covers the US.
Information security firm High-Tech Bridge, based in Switzerland, has researched the claims.
A spokesman for Facebook told the Mail they believed the allegations were 'without merit' and that they would defend themselves 'vigorously'.