http://www.bbc.com/news/technology-34264624A "dislike" button has been constantly requested by some users since the introduction of the now-iconic "like" button in 2009.
"People have asked about the 'dislike' button for many years," Mr Zuckerberg told the audience on Tuesday.
"Probably hundreds of people have asked about this, and today is a special day because today is the day that I actually get to say we are working on it, and are very close to shipping a test of it."
Finally