"Visa, AmEx, and Mastercard are refusing to process ads on Backpage.com’s “Adult Services” page. These three credit card companies are taking a strong stance in showing human rights and dignity are worth more than profits, and it is important we show our support!
Sign this thank you letter to stand with Visa, AmEx, and Mastercard and to encourage other online payment and credit card companies to take the same action."
From the link below, scroll down to "2. Thank Credit Card Companies for Standing Up against Backpage.com."