Twitter: Paid tweets only via its own advertising system
Twitter only wants to allow itself to advertise in future. The guidelines have been revised to the effect that third parties and developers will no longer be allowed to integrate ads into users' streams in future.
In future, Twitter will reserve paid tweets for its own advertising system "Promoted Tweets", which was launched in April. The company justified the move by stating that the "user experience" should be preserved. However, there is also talk of costs - security, user support, etc. - that the company has to bear in order to keep the advertising system running. Twitter clearly does not want to bear these costs for third-party advertising networks.
