One Tweet From Elon Musk Made $580 Million DisappearMatt Novak6/08/16 10:40am30610EditPromoteGo to permalinkTweets are mysterious things. They’re sometimes witty, usually banal, and often garbage. But if you’re Elon Musk, your tweets can have a very real impact on how companies are valued. For instance, one tweet from Musk last night wiped out $580 million from Samsung SDI’s market capitalization. No joke.