Zero
6 : In addition to its messaging component, Telegram has a social networking dimension. Our massive public one-to-many channels can have millions of subscribers each and are more like Twitter feeds. In many markets the owners of such channels display ads to earn money, sometimes using third-party ad platforms. The ads they post look like regular messages, and are often intrusive. We will fix this by introducing our own Ad Platform for public one-to-many channels – one that is user-friendly, respects privacy and allows us to cover the costs of servers and traffic.
Part 6 of https://t.me/durov/142
Part 6 of https://t.me/durov/142