The secrets of Twitter's success

For a company that's just two years old, Twitter has come a long way. It has an estimated 18 million users and is already playing a role on the world stage, most recently as an organizing and reporting tool in Iran. The company's co-founder, Biz Stone, came to Cannes to impart some lessons on Twitter's phenomenal growth in what was billed as the first Cannes Tweetup by seminar presenter Hill & Knowlton. Going over the development of Twitter and taking questions posted to the service, Stone hit on some useful themes for marketers.