Libel threat arising from Amazon book review

I recently posted a book review on Amazon.co.uk in connection with a
lottery system book which, as I stated in the review, was a scam and a
fraud. I repeated my statement in the book's discussion forum on the
main Amazon.com website. After a few hours, the author posted a
message on this forum stating that he had read my review of his book
and was going to take legal action against me. No warning was given,
just a terse threat. I then deleted both the review and the offending
statement on the discussion forum.

Can the author still sue me? Do I have any defence on the basis of my
right to freedom of speech, as defined in European human rights
legislation?

.

Relevant Pages

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