SAN FRANCISCO — How does a 28-year-old make $400 million in 18 months?
With the right idea at the right time in mobile apps for smartphones.
Kevin Systrom won the start-up sweepstakes this week when Facebook Inc. said it would pay $1 billion in cash and stock for his photo-sharing app maker, which has a loyal following of 30 million users but never made a dime.
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