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The blogger, who uses the account name "Cyxymu," (the name of a town in the Republic of Georgia) had accounts on all of the different sites that were attacked at the same time, Max Kelly, chief security officer at Facebook, told CNET New

A Georgian blogger with accounts on Twitter, Facebook, LiveJournal, and Google's Blogger and YouTube was targeted in a denial-of-service attack that led to the sitewide outage at Twitter and problems at the other sites on Thursday, according to a Facebook executive.

Kelly declined to speculate on who was behind the attack, but he said: "You have to ask who would benefit the most from doing this and think about what those people are doing and the disregard for the rest of the users and the Internet."

in January this year Twitter announced that 33 accounts had been hacked, including those belonging to US President Barack Obama and singer Britney Spears.

Denial-of-service (DOS) attacks take various forms but often involve a company's servers being flooded with data in an effort to disable them.

Twitter was taken offline for more than two hours whilst Facebook's service was "degraded", according to the firms.