Very weird, because this doesn't solve the mystery of usmysteryshopper.com.. In fact, Shadow12's post about Mysteryshopping.com is totally irrelevant to the OP's post. usmysteryshopper.com is not related to Mysteryshopping.com or to The Shadow Agency.
To over-simplify, usmysteryshopper.com is an advertising site that apparently uses something similar to a lottery system to award one person out of an unspecified number of applicants a gift card to eat somewhere (or whatever). You sign up and select which gift card you want. You provide your info and then go through several screens in which they try to sell you all kinds of things. After that, your name/email address goes in a lotto and MAY be awarded the gift card. IF you are awarded the gift card, after visiting the location, you write a short social media review of the client. In the meantime, your email address is provided to all their clients, who begin to spam you with their advertising offers.