Columnist Threatens to Sue Blogger
No. You are talking about libel. Earlier this year bloggers gained protection from libel prosection.
If you publish -- in any form -- you are beholden to laws ...
Luskin's lawsuit is grounded on defamation. I can defame you and be sued for it without publishing anything; e.g., I can just go stand in a crowded public place and tell everyone you are a child molester.