Cohen took her case to the Manhattan supreme court in an attempt to have the blogger -- writing under the moniker "Anonymous" -- unmasked, so that she can sue them for defamation.
The piece appeared on the (which is no longer live) and described Cohen in less-than-flattering words -- using terms including "skank" and "old hag".
The post drew the ire of Cohen earlier this year, after she read comments that, among other things, suggested she was in her 40s (she is 37) and "may have been hot 10 years ago".
Joan Madden, the New York supreme court judge who delivered the ruling, rejected the blogger's defence that blogs were a "modern day forum for conveying personal opinions, including invective and ranting".
The judge said that anonymous bloggers should be held to account if their comments were too derisive.
Steven Wagner, Cohen's lawyer, said the blogger would now be sued for libel.
However, Anne Salisbury, the defendant's lawyer, argued that Cohen had used the case to attract publicity rather than to restore her reputation.
Salisbury added that the ruling had "potentially damaging implications for free speech on the internet".
Google said that it understood that cyber-bullying could have a detrimental affect on people but added that it also respected privacy and would only reveal an anonymous blogger's identity when ordered to do so by a court.
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