Sir Martin Sorrell's media buying arm GroupM to stop clients' ads appearing on sites carrying pirated content.

This article titled “WPP blacklists more than 2,000 US websites” was written by Mark Sweney, for guardian.co.uk on Wednesday 8th June 2011 16.43 UTC

Sir Martin Sorrell’s WPP has blacklisted more than 2,000 US websites that carry illegal or pirated content to ensure client ad campaigns only appear in legitimate digital media space.

The US division of GroupM, WPP’s media planning and buying operation, spends about .5bn (£2.1bn) annually on buying ad space on websites on behalf of clients such as Ford, Unilever, AT&T and IBM.

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