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Square photos, filters, iPhone only
Instagram launched on 6 October 2010 as an iPhone-only app for square photos with retro filters and reached a million users by December. Its filters, such as X-Pro II, Lomo-fi and Earlybird, made...
Kevin Systrom and Mike Krieger released a free app for square, filtered photos; it gained 25,000 users on its first day and a million by December.
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The social network at 500 million users
In 2010 Facebook was six years old, had just overtaken Google as the most-visited site in the United States on some weekly measures, and passed 500 million users in July. Its blue-and-white pages...
