Telegram, the most popular messaging app used in Russia, suffered a temporary outage on February 27 for unexplained reasons while some previously blocked social media apps including Instagram and Facebook suddenly became available in Russia. The monitoring center for Russia's public communications network said its specialists had recorded a "massive failure" of Telegram, though it was not immediately clear why. Russia's Digital Ministry said in a statement that work had begun to restore Telegram and a number of other services in Russia, adding that there had also been failures of the app outside Russia.