Sir Martin Sorrell
Media playback is unsupported on your device

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

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.

Go to next video: Facebook value set at up to $95bn