There is some API for sending tweets, but no idea if they can be used by addons/scripts :x
https://github.com/Gethe/wow-ui-sour...zzard_SocialUI
Code:
C_Social.TwitterCheckStatus
C_Social.TwitterConnect
C_Social.TwitterDisconnect
C_Social.TwitterGetMSTillCanPost
C_Social.TwitterPostAchievement
C_Social.TwitterPostMessage
C_Social.TwitterPostScreenshot