The DOS attack hit several sites, including LiveJournal and Facebook, but Twitter has been by far the most affected, as it went offline for hours on Thursday.

As speculation brewed over who is responsible for the attack, a blogger from the country of Georgia blamed Russia for it, saying it's an attempt to silence him, according to a Friday in The Guardian.

The blogger, identified as Cyxymu, told the Guardian that he believes the Kremlin was behind the attack because he has been critical of Russia's policies and actions towards Georgia, specifically regarding the military conflict over the South Ossetia region.

"Maybe it was carried out by ordinary hackers but I'm certain the order came from the Russian government," the blogger told The Guardian. "An attack on such a scale that affected three worldwide services with numerous servers could only be organized by someone with huge resources."