“Take for example a tweet which is per se derogatory, abusive or contains graphic pornographic material. Can one who re-tweets such a tweet say he has only re-tweeted the material and is not the author of it and hence should not face prosecution?”

said the SC judge in AAP’s defamation case.

Source: Supreme Court: Re-tweets can be defamatory, SC says in AAP neta’s case | Delhi News – Times of India