As terror attacks put France into a national state of emergency on Friday, AirBnB, Facebook, Google, Skype, Twitter and Uber launched into disaster response mode. AirBnB contacted all hosts in Paris asking if they could take in those stranded in the city. Facebook let users alert their friends they were safe. Google offered free calls to Paris via Hangouts, as did Skype, Verizon and Sprint. Uber turned off surge pricing in the city for the weekend, despite initial reports to the contrary. Twitter helped people find a place to stay with the hashtag #PorteOuverte and kept the rest of the world informed.

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