You need to quantify your claim. First you need to prove a non privileged publication that is untruthful.
Small claims may be OK but is generally not the appropriate forum to claim punitive damages since the proceedings are brief, the technicalities involved in proving the net worth of defendant are burdensome in such forums.
If you file in a civil court you may get hit with an ANTI SLAPP motion. You really need to talk to a lawyer if this is worth while for you to do it.
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Defamation actions involving internet postings are difficult. This is not something that you would be likely to win in small claims court.
You need to consult an attorney that handles these types of claims.
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