A BLOGGER who characterised anti-porn activist Melinda Tankard Reist as a ''fundamentalist Christian'' says she has been asked to apologise - or be sued.

Tankard Reist - who briefed lawyers to warn off liberal blogger Jennifer Wilson - says it's not being called Christian she objects to, but the claim that she is ''deceptive and duplicitous about her religious beliefs''.

Melinda Tankard Reist.

She has sought legal advice from Canberra defamation lawyer Ric Lucas, who once represented Opposition Leader Tony Abbott and former treasurer Peter Costello and their wives in a successful action against publisher Random House over false claims in a memoir by Bob Ellis.

While Tankard Reist has not gone so far as to issue court proceedings yet, she complains social media has intensified the level of vituperation against outspoken figures such as herself.