Insight: Social media makes anti-Putin protests snowball | Reuters
An article about why LiveJournal has had trouble:
"... Many bloggers fear the Kremlin will act to reign in Russia's vibrant blogosphere, if it becomes too influential. Some bloggers have already been prosecuted offline under libel law and Russia's wide-reaching law on extremism. Distributed denial of service (DDoS) attacks - attempts to make a computer or network unavailable - have in the last few days shut down a large number of media websites. Russia's most popular blogging site, LiveJournal, was hobbled."