I asked Posterous co-founder Sachin Agarwal how Posterous will actually make money. His answer was simple. Charge for business and commercial use of Posterous...One of Posterous’ first “clients” is Coca-Cola, which is definitely a good first start. Coca-Cola is using Posterous for its NCAA “Dept of Fannovation” where people can come up with ideas to improve the experience of being a fan, and a chance to win $10,000. (full article...)