What’s the meaning of “You’ve already sent this tweet today”?

“You’ve already sent this tweet today. Because of Twitter policies it will not be published. Edit it to make sure it gets published”

This warning message appears when you try to schedule or publish tweets with the same or similar content to other messages that you have already scheduled or published and between of them there is a short time. That’s because Twitter can consider the message as duplicated and publish the first one while others can be rejected.

If your posts are not published, you will receive the following messages (depending on your e-mails and notifications preferences)

E-mail:

Notification:

You will see the post in your Calendar with a yellow stripe with the legend: Error in Posting. Check that your messages don’t break the proposed requirements by Twitter to avoid problems.