There’s never been a shortage of people telling Mark Zuckerberg what he should be doing with Facebook. Biz Stone is the latest, and at least has the credentials of being one of Twitter’s founders. He’s a relatively new (re)convert to Facebook, having become overwhelmed with noise on his newsfeed a few years ago. Now he’s got an idea for the social network. “I’ve got an idea for Facebook. They could offer Facebook Premium. For $10 a month, people who really love Facebook (and can afford it), could see no ads,” writes Stone in a blog post. “Maybe some special features too. If 10% percent of Facebook signed up, that’s $1B a month in revenue. Not too shabby. It’s a different type of company, but by way of validation, have a look at Pandora’s 1Q14 financial results. Of all Pandora’s revenue generators, the highest growth year-over-year by far (114% growth rate) is in subscriptions—people paying a monthly fee for an ad-free experience.” An ad-free Facebook has rarely been talked about by the company or its investors – with global paid advertising on the service predicted to reach $5.89bn this year, it’s been understandably focused on that. But Stone’s theory is certainly something to think about.