Facebook users will soon be able to “dislike” posts and pictures. During a question and answer session Tuesday, Facebook CEO Mark Zuckerberg announced that the social networking site is working on a “dislike” button. As Zuckerberg explained, Facebook has been reluctant to add a “dislike” feature because it didn’t want to create an environment where users were “voting up or down” on others’ posts. He said the “dislike” button allows people to express emotions for things that aren’t necessarily positive.