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 startup created by Gmail's first engineer Paul Buchheit. In February 2010, Facebook acquired Malaysian contact-importing startup Octazen Solutions. On April 2, 2010, Facebook announced acquisition of photo-sharing service called Divvyshot for an undisclosed amount. In June 2010, an online marketplace for trading private Facebook stock reflected a valuation of $11.5 billion. On April 12, 2012, Facebook acquired photo sharing service Instagram for approximately $1 billion in cash and stock. On March 8, 2013, Facebook announced that they acquired the team from Storylane, but not the product itself. On February 19, 2014 Facebook announced its acquisition of WhatsApp Inc., a