Velocity Alert: Pizza delivery guy is brought to tears with generous tip

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THIS STORY IS ABOUT TO GO VIRAL

Pizza delivery guy is brought to tears with generous tip 'It just really, truly amazes me that people who don't even know me wanted to help me out that much.' 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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