You are not truly anonymous on the internet. There are people here who know my name, for example, as well as non-FReepers who know that I post here under this screen name. I suspect that is the case with many of us. From the EFF =>
To state a defamation claim, the person claiming defamation need not be mentioned by namethe plaintiff only needs to be reasonably identifiable.
https://www.eff.org/issues/bloggers/legal/liability/defamation
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Secondly I called him a "Dope Pusher", i.e. someone who is pushing dope, and in a discussion forum can only mean advocating dope, which can be factually demonstrated by a perusal of his posts.
Oh dear. Good luck convincing a court with that argument.
Reason number 3 trumps all. I don’t give a sh*t.