By Brian Morrissey
Twitter and Facebook have been mentioned in more seminars at Cannes than not. Twitter co-founder Biz Stone had a prime speaking slot, and Facebook's top sales exec, Mike Murphy, was on a panel. With social on many people's lips and minds, WPP CEO Martin Sorrell used his panel of top marketing execs to ask about their personal use of social media. The results were mixed. Brian Perkins, corporate vp at Johnson & Johnson, is the most active, maintaining Facebook and Twitter accounts. Marc Pritchard, global marketing officer at Procter & Gamble, uses Facebook. But Mary Beth West, CMO at Kraft, uses neither. Ditto for McDonald's CMO Mary Dilllon. Dillon chalked up her non-participation to simply not having the time. Still, she said, "I'm a big student of social media." Sir Martin didn't reveal his social-networking habits, although he has been schooled in the finer arts of Facebooking by none other than Mark Zuckerberg. What's more, he opened up the panel to audience input by taking questions through that old-school social tool: e-mail.