Facebook is thinking about adding a way to "dislike" posts on its site, founder Mark Zuckerberg has said.
Speaking at a Q&A session in California, he said it was one of the most requested features the social network receives from its users.
He said the site would need to find a way to make sure it did not become a way to demean people's posts.
According to Facebook's own figures, 4.5 billion "likes" are generated every day.
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BBC News - Facebook thinking about 'dislike' function - Zuckerberg