2010
Kevin Systrom, Instagram co-founder, in 2011 — a year after launching the photo app that Facebook would buy two years later for $1 billion. Kevin Systrom and Mike Krieger launch Instagram on October 6, 2010 — initially as a photo-only app with built-in filters that make iPhone photos look like Kodachrome film. 25,000 users in the first 24 hours. Facebook buys it for $1 billion two years later, on the eve of its IPO.
Source: Wikimedia Commons
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