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Foursquare celebrates '4sqDay' with 20 million users, two billion check-ins since launch
Mathematically-speaking, four squared is 16, so 4/16 — as in, April 16th, which is today — has Continue reading…
Article
Mathematically-speaking, four squared is 16, so 4/16 — as in, April 16th, which is today — has Continue reading…