The Georgian blogger whose Twitter, Facebook, and YouTube accounts were targeted in denial-of-service attacks on Thursday, says he thinks Russia's federal security service is behind it.

"This hackers was from Russian KGB," the blogger, who uses "Cyxymu" on his accounts, wrote in a tweet early on Friday, adding later: "My twitter is online! Thank you all for support after ciber attack from Russia!"

Because of the difficulty in tracing distributed denial-of-service (DDoS) attacks back to the source, unless someone takes credit for the attack or brags about it to online associates, it's nearly impossible to determine exactly who was responsible.

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