So apparently there was a recent change to the FA Terms of Service. Click the link below to learn more:

http://help.furaffinity.net/article.....s-Viglink.html

Thanks go to  Mazz for making me aware of this.

I personally chose to opt out. As far as I know, FA does not require credit card numbers or address information or anything like that, but I still don't like people sharing information about me without my permission, especially if it's to solicit me for business. When I want something, I can find it and get it on my own. I don't need help from advertising companies.