Sir Martin Sorrell
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Facebook IPO: Sir Martin Sorrell on the platform's appeal

17 May 2012 Last updated at 02:36 BST

Social networking site Facebook will partially float on the US stock exchange on Friday, with the company valuing itself, in total, at $100bn.

Sir Martin Sorrell, boss of advertising firm WPP, assessed the strengths and weaknesses of the platform for advertisers, with Rory Cellan-Jones.