How Instagram Founder Kevin Systrom Won The Start-up Sweepstakes

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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