Why Facebook didn't add a 'dislike' button?

Question

On 2 July 2018 Facebook briefly suspended the posting of one of 12 excerpts from the USA's Declaration of Independence, which contained what phrase?

Answer 1

This is completely my view and is just a comment on the topic -

While many users love the idea of Facebook adding a dislike button, I don't think there are many users who are dying to have their own content disliked.

Disliking provides feedback to the poster which would generally discourage them from sharing. Liking provides feedback to the content poster, but it also provides a way to share good content with friends in their News Feeds. Disliking wouldn't result in anything being shared (because why would your friends want to see what you disliked?), so it would be a much more neutered functionality than liking.

Plus, Facebook would have to introduce the word "Undislike" to support undoing, which is just incredibly awkward.

Answer 2

Let me put my understanding which I got from QueryHome -

When a user receive a downvote(same as dislike) his/her participation goes down, though we are purely a knowledge sharing site but in place of improving the writing in the next Q&A user actually stops the writing itself in the fear of downvote.

Now similar logic applies to the facebook also their strength is more and more communication and if people reduces their communication means lower business so now reason is simple.