potentialpredators.com Blackmail, extortion,slander Internet

I went to check my email on September 13 and found that I had gotten an email from potentialpredators.com saying that they had listed me as a potential predator. I clicked on the link and of course was very pissed off when they told me that I would have to pay $100 to get my name off the list. So like an idiot I payed it and they did take my name off the list but then I started going through their list of people and found to people of interest Chris Hansen and James Holmes both which are known nationwide and thats when I figured out that I had been ripped off so I wrote them 3 emails which have gone unanswered but the money I paid is back in my account. The best advice I can give is write them and inform them that you will sue them for slander as their servers are not located in the USA there fore they are no protected from being sued. How do they get a hold of my information? Its pretty simple they send people out on to the net looking for peoples information and then they post it on their site. The best thing to do is change all your settings to private and if you have a personal picture up change it to something different. They got mine off of craigslist so I would be careful putting a picture on their. Also go on their facebook page, report them for being a scam, and write something on their wall and let people know that they blackmail innocent people to get rich quick. Let us unite against them and show them that we wount be bullied. They are most likely in Germany or Panama.