Russia's state media censors, the Roskomnadzor, apparently issued the demand in response to a change in the site's terms and conditions. "They changed their user agreement some months ago. And if you read that, people must provide a set of metadata, which in our understanding as a whole counts as personal data and [makes it possible] to identify an individual," Roskomnadzor chief Alexander Zharov told the Financial Times.
Russia also passed a law last year requiring any site with user data of Russian citizens be located within the country starting this September. Noncompliant sites are subject to fine and blocking, though there's no word on how Russia would actually enforce these sanctions should Twitter decline. Facebook is reportedly also on notice, though it stated earlier this year that it would comply with the order.
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