Such instructions could actually endanger people — citizens receive air strike warnings via smartphone alerts. For example, WhatsApp restricted the number of times a user could forward something, and developed automated systems that detect and flag objectionable content. Anastasia Vlasova/Getty Images In February 2014, the Ukrainian people ousted pro-Russian president Viktor Yanukovych, prompting Russia to invade and annex the Crimean peninsula. By the start of April, Pavel Durov had given his notice, with TechCrunch saying at the time that the CEO had resisted pressure to suppress pages criticizing the Russian government.
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