Velocity Alert: Lego's secret 'Frozen' castle is on sale for Christmas — if you know where to look

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THIS STORY IS ABOUT TO GO VIRAL

Lego's secret 'Frozen' castle is on sale for Christmas — if you know where to look The "Frozen" Lego set isn't available in the U.S. until January, yet you can still pick one up with some research and some luck. 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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