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Le Meur is a compulsive communicator. And that has served him well. He has run a string of startups, founded a popular conference in Paris called Le Web that brings together bloggers from around the world, and started one of the most popular blogs in France. Right now, few people are more rabid about the possibilities of Twitter and its short burst of communications than Le Meur. He parlayed that obsession into a startup, Seesmic, a sort of video version of Twitter, where people can post short videos and react to each other's clips. But mostly, it's Le Meur's irrepressible enthusiasm for all things Internet that has made him someone to watch.