PARIS (Reuters) – Instagram's youthful Chief Executive Kevin Systrom allowed himself a luxury at a Paris technology conference that he never feels comfortable doing in San Francisco: wearing a tie. The founder of the popular photo-sharing app, now owned by Facebook, looks less comfortable when asked whether he'll soon be adding advertising to his service. “We don't have any specific plans to share about advertising yet, mostly because we're focused on growing the company as quickly as possible,” Systrom said in an interview with Reuters TV at LeWeb technology conference in Paris. …

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Instagram’s Systrom coy on ad plans, user data