Facebook has the ability to detect that you are typing even if you do not post the content
Facebook has the ability to see what users type even if the posts are not published. Apparently, users were notified about this setting in the Data Use Policy — a statement that I bet barely any of Facebook’s users have read through. Facebook can track any post that is longer than 5 characters typed into the social network even if the post is never published, according to the L.A. Times.
According to research, posts are considered self-censored if it is not published within 10 minutes. Facebook said that they do not record the exact content of what users type before it is published, but they can track that users are typing something. Facebook has no plans to track unpublished words.
“We receive data about you whenever you use or are running Facebook, such as when you look at another person’s timeline, send or receive a message, search for a friend or a Page, click on, view or otherwise interact,” says Facebook in their Data Use Policy.