Twitter Co-Founder Thinks Facebook Should Charge Users For Ad-Free Version Twitter Co-Founder Biz Stone has given Facebook advice on how to run its business. In a post on Medium, Stone suggested the social network should charge users $10 (£6.55) per month for an ad-free 'premium' version. Read More news, social mediaJason EnglandJuly 21, 2013Ad free, Biz Stone, Facebook, Twitter, advertising, premium