I am in the process of building a web-based framework to implement a search engine based on Facial Recognition, it will feature a paid service and a members only area, to protect not only the users, but also the ones who have been searched through the crawler. I have a 2 part question and was hoping it could be answered here.
First question being, the image of the subject in mind will be uploaded to the search engine, and it will compress that image down to the face, and hash that image. Once that image is hashed and discarded, it will use that hash to verify the identity of that person, using websites that are commonly used such as Facebook, Twitter, and Tumblr, once identity is confirmed it will crawl known and common dating websites. My question is, Is this first part of data collection against any type of law, because the crawler will also extract not only the person's identity, but also if they are married, and to whom they are married to.
Which leads me to my second question, in the event that no laws are broken, what should the Terms of Service and legal disclaimer cover, to keep any type of legal recourse from coming back onto me as the owner/webmaster of the site.