Facebook like button years of questions from the public about whether it had an intention to incorporate a "Dislike" button, Facebook officially rolled out "Reactions" to users worldwide on February 24, 2016, letting users long-press on the like button for an option to use one of five pre-defined emotions, including "Love", "Haha", "Wow", "Sad", or "Angry". Reactions were also extended to comments in May 2017. The like button is one of Facebook's social plug-ins, in which the button can be placed on third-party websites. Its use centers around a form of an advertising network, in which it gathers information about which users visit
History of Facebook a new concept called company pages was planned. In October 2008, Facebook announced that it would set up its international headquarters in Dublin, Ireland. In 2010, Facebook began to invite users to become beta testers after passing a question-and-answer-based selection process, and a set of Facebook Engineering Puzzles where users would solve computational problems which gave them an opportunity to be hired by Facebook. As of February 2011, Facebook had become the largest online photo host, being cited by Facebook application and online photo aggregator Pixable as expecting to have 100 billion photos by summer 2011. As of October 2011,