Please report him anyway; most people are decent and honest, and like to think the best of people, so I understand why you wouldn't want to report him, not to mention the hassle of writing it up and sending it to Twitter, who may not even act on it, but you can be sure if you don't take it further, the guy will be able to keep doing this with impunity. Some quote about evil and good men and doing nothing.

This is sometimes the best way. If you get them blocked from Twitter they may take that as meaning "the fight is on" and register many fake accounts to continue posting the reviews from.

Not doing the right thing for fear of retribution? Staying quiet essentially allows them to do the same to others.

Fear should never dictate the decision process. They need to be reported.

If the damage done is somewhere between zero and negligible and you don't know you are not the only one affected, inaction is sometimes the best policy. The idiot will get bored from getting no reaction and fade away. Reporting them won't stop them doing the same thing to others and more and inaction will - they can do the same thing to others using new accounts just as well as they can re-hound you with new accounts.

It is the same as arguing with idiots, as the old saying goes: they will drag you down to their level then "win" through a mix of experience and perseverance. (please note: this is a general comment, I'm not intending to call you an idiot at all here!). I dealt with bullies as lot in earlier life and random fools on the Internet are absolutely no different (aside from getting their apparent confidence due to relative anonymity rather than size of fighting experience). Sometimes ignoring them is the best policy for all (though, of course, use your judgement).

Of course if they are causing appreciable damage, the picture is different. And don't just report them to twitter. If they are trying to extort money from your business, report them to the relevant legal authority (if one is clear, this unfortunately can be difficult to determine).

True. I think I've done enough to embarass the guy and expose the way he does business. I always believe you should leave a door open for people to 'save' themselves, and that might mean that long term, he proves to be a valuable member of the tea community. Who knows.

Of all parties involved, Twitter is best-equipped to try and detect that behavior.

Tweets fade from the public stream fast. However twitter themselves can research his and your entire timeline and ban him just fine even if you can no longer access the conversation.