Nearly one year after the Georgia-Russia war began, Twitter suffered about three hours of downtime on early Thursday while Facebook and LiveJournal also suffered brief outages.
Though it has still not been confirmed who is behind the attack, Facebook told UK's Guardian and BBC News that it believes that the Russian government ordered the attack.
Facebook told the UK media outlets that the attack was targeted at a pro-Georgian activist blogger known as Cyxymu, who had previously criticized Russia for the way it handled the war over the South Ossetia region.
The social network site also issued a statement that said the attack on Facebook, Twitter and LiveJournal, where Cyxymu had accounts, "appears to be directed at an individual who has a presence on a number of sites, rather than the sites themselves" and was intended "to keep his voice from being heard".
Search engine Google was also a major target of the DDos attack, but managed to steer clear of any service disruptions.
The company said in a statement that its "systems prevented substantive impact to [its] services".
Google did not specify which services were targeted, but many believe that the company's Gmail and YouTube services were attacked.
This is not the first time that anti-Georgia Russian hackers have used the Internet to get their message out.
Last July, pro-Russian hackers defaced more than 300 Lithuanian sites with the banned hammer and sickle and the five-pointed star symbols, as well as profane messages.