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Eventually, Twitter became so popular and successful that even the President of the
United States is a Twitter user. Here President Barack Obama uses Twitter to hold a live
question-and-answer session in the Roosevelt Room of the White House in December
2012.
his own company. His company dispatched couriers, taxis, and emer-
gency services using the Internet. But it wasn’t making Jack much money,
so he tried out several different jobs over the next few years. He even
spent some time studying massage therapy! None of the jobs he had felt
like the right fit, though.