For panel moderators, there's a cardinal rule: don't be boring. On the other hand, don't be too interesting, either. Yesterday at South By Southwest, the internet conference in Austin, Sarah Lacy of Business Week tried to liven up an interview with Mark Zuckerberg, the painfully monosyllabic founder of Facebook. Her provocative interjections didn't elicit any great revelations from the social network pioneer. But they did irritate the audience of geeks who'd come to be bored by Zuckerberg rather that stimulated by his interrogator. This clip is the closest I've seen to an audience revolt.