Oh I have had already 2 threats for sueing and nobody sued me, lol.
The first one was a user who asked me to delete him cause he didn't want us to have his personal info (lol!). I said no as we never delete members, that's our policy and guess what? He did not sue us.
The second and most annoying one was the admin of another site which has one third of our members. I told him he had double accounts in his forum (I had evidence for it from one of his previous moderators that is now my friend) and he said he would sue me for that and bring as witnesses the persons I acussed to be his accounts. He even closed his forum for some days with a message that said (amongother things) that the site is in legal dispute.
However, regardless all these, he did not sue me, did nothing at all and re-opened his site after some days. I think he did it to attract new members but his site died after that. Most members he had stopped coming for some reason... Justice after all