Can an app developer build its own Twitter?

Twitter may be one of the most popular platforms on which developers and
entrepreneurs are building applications, but in 2011, its relationship with developers has changed dramatically.

Last month, Twitter told developers that it should focus on developing
tools that don’t play a role in the core user experience for
consumers. For the companies behind some of the most popular third party clients, the message was clear: thanks, but your services are
no longer needed