Velocity Alert: Facebook activates Paris safety check following terror attacks

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THIS STORY IS ABOUT TO GO VIRAL

Facebook activates Paris safety check following terror attacks The feature, which has previously been used in natural disasters, allows people in the affected areas to let Facebook friends know they are safe. How does Mashable know what's going viral? Mashable built a system called Velocity, which scours the social web, collecting lots and lots of data around how people are engaging with published articles. It then pulls all of that data back to Mashable, dumps it into our own predictive engine, and predicts which articles are about to go viral. Read more at Mashable.com ▶ Mashable, Inc. is a Delaware Corporation. P.O. Box 64 New York, NY, 10159-0064

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