Usage of Flipboard has increased drastically over the past year. The company behind the social newsreading app, which is celebrating its second anniversary Tuesday, announced it now has more than 20 million registered users, up from 5 million in December.

Flipboard owes that growth largely to platform and geographic expansion. After nearly a year-and-a-half as an iPad-only application, Flipboard launched on the iPhone in early December, growing from 4 million to 5 million users in a week. In late June, the app arrived on Android smartphones. Flipboard also released a number of international editions with region-specific content, including China, France, Germany, Italy, Korea, the…
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