Centuries-Old Benefit Lets U.S. Lawmakers Use Tax Dollars For Social MediaOctober 6, 2014 | Matt LasloA mailing privilege given by the Founding Fathers in the 18th Century to U.S. lawmakers so they could stay in touch with folks back home is being used to pay for social media advertising in the 21st Century. Listen /Update RequiredTo play audio, update browser or Flash plugin.