Full Title: Putin vows to take down Twitter: Service will be blocked in Russia in 30 days if it does not delete 'banned content' related to porn, suicide and Alexis Navalny protestsRussia has threatened to block Twitter within 30 days unless the site acts to remove what the government refers to as 'banned content'.Vadim Subbotin, deputy head of watchdog Roskomnadzor, said on Tuesday that the ban would come into effect unless Twitter removed the content, which he said includes child porn and information on child suicide and drugs.But critics say the crackdown is actually an attempt to stop Putin's political...