Messages are not fully encrypted by default. That means the company could, in theory, access the content of the messages, or be forced to hand over the data at the request of a government. Telegram boasts 500 million users, who share information individually and in groups in relative security. But Telegram's use as a one-way broadcast channel β which followers can join but not reply to β means content from inauthentic accounts can easily reach large, captive and eager audiences. Telegram was co-founded by Pavel and Nikolai Durov, the brothers who had previously created VKontakte. VK is Russiaβs equivalent of Facebook, a social network used for public and private messaging, audio and video sharing as well as online gaming. In January, SimpleWeb reported that VK was Russiaβs fourth most-visited website, after Yandex, YouTube and Googleβs Russian-language homepage. In 2016, Forbesβ Michael Solomon described Pavel Durov (pictured, below) as the βMark Zuckerberg of Russia.β The Dow Jones Industrial Average fell 230 points, or 0.7%. Meanwhile, the S&P 500 and the Nasdaq Composite dropped 1.3% and 2.2%, respectively. All three indexes began the day with gains before selling off. Some privacy experts say Telegram is not secure enough
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