How social network make money - The founders of wayn discovered that many users were joining but few would take the time to go through the process of manually adding their friends – resulting in a missed opportunity for membership growth and, potentially, a shorter period of activity as users that did not make new connections might drop out. Like gumroad, sellfy and amazon's kdp program make it easy for you to publish and sell your pdf, mp3 or video file at a price of your choosing -- keeping in mind that all platforms do take a cut, even if it's small. Twitter's status as a place to find instant, unfiltered, democratized updates on everything from celebrity arrests to international civil unrest might make it important to the modern exchange of ideas, but again, that's secondary to keeping the advertisers happy. You also have to beware of over-promoting products for want of money, because if your followers see that you're constantly tweeting about one product or another, not only will they not click on the links, they will also un-follow you.
How Social Networks Make Money - A Tour Of Facebook's Ad Management System.