All of the apps you mentioned are third-party. We do not directly develop the mail or browser programs. I'm not sure what you meant about Contractor, because w

All of the apps you mentioned are third-party. We do not directly develop the mail or browser programs. I'm not sure what you meant about Contractor, because we definitely do have API guidelines for it. Also, there is an excellent third-party Twitter app for elementary OS called Birdie: http://birdieapp.github.io/ http://birdieapp.github.io/ I appreciate the input :)