A New York Court has held that if an online publisher re-publishes a defamatory statement, that does not make the republisher liable for defamation — with the caveat that the republisher relies on a reputable source.
“A re-publisher of a work may rely on the research of the original publisher, absent proof that the re-publisher had or should have had substantial reasons to question either the accuracy of the article or the good faith of the reporter.” (source)
I have not seen the complete decision yet, so I am relying on Courthouse News Service for this information. But, according to this decision, I should be able to do that. Courthouse News Service is a reliable source.