yoohoo999 – just read your LIBEL LIABILITY link and I don't see how this can be relevant to the thread. You're quoting Godfrey vs Demon Internet – a case where an individual felt he had been defamed on forum newsgroup hosted by Demon. This individual complained numerous times and was unsuccessful in getting the article removed. Here lies his case.
Demon had no procedure and were uncooperative in removing the said article.
In the defence of "Innocent dissemination" – ie if a formal complaint is made and the defendant then removes the article. There is no case to answer for.
Therefore, you have to find the current owner of the bicycle. Prove he purchased it in good faith and then lodge a formal complaint against the forum host. This is if you are to pursue the Godfrey vs Demon case law.
I wish you success in identifying the individual. In fact, even if the internet biking world is large enough and the picture clear enough to find him (which I doubt) – he can only request for the thread to be removed. And we've seen that many times on here. End of.
"The first thing we do, let's kill all the lawyers."
William Shakespeare