Real Estate Internet Website Law

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Hello- Just wondering if anyone knows of any real estate internet website law? I just started an nationwide real estate internet business couple of weeks ago - (It is 80% done)and I bring buyers and wholesalers together. I only charged for subscription to view the address and contact information. Im just checking last minute to be sure that I have covered my rump and that there is no law against this. Im just a third party who is hosting the site for wholesaler to list their property and investor or homebuyers contact them directly.