Followers: 1.8 million
Sample tweet: "This still gets me a little teary-eyed: City council votes for Zappos to take over Las Vegas City Hall: http://bit.ly/dTwBnl"
A shoe store with a Twitter profile? Bo-ring. But Zappos' quirky image and customer-centered focus keeps this one interesting. CEO Tony Hsieh makes the feed lively with links to articles about entrepreneurship and news about the country. The best part? Hsieh resists the temptation to overtweet. This is one dotcom executive who won't overwhelm your stream.