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Concept
Like button
Summary
A like button, like option, or recommend button is a feature in communication software such as social networking services, Internet forums, news websites and blogs where the user can express that they like, enjoy or support certain content. Internet services that feature like buttons usually display the number of users who liked each content, and may show a full or partial list of them. This is a quantitative alternative to other methods of expressing reaction to content, like writing a reply text. Some websites also include a dislike button, so the user can either vote in favor, against or neutrally. Other websites include more complex web content voting systems. For example, five stars or reaction buttons to show a wider range of emotion to the content.
Video sharing site Vimeo added a "like" button in November 2005. Developer Andrew Pile describes it as an iteration of the "digg" button from the site Digg.com, saying "We liked the Digg concept, but we didn't want to call it 'Diggs,' so we came up with 'Likes'".
The like button on FriendFeed was announced as a feature on October 30, 2007, and was popularized within that community. Later the feature was integrated into Facebook before FriendFeed was acquired by Facebook on August 10, 2009.
Facebook like button
The Facebook like button is designed as a hand giving "thumbs up". It was originally discussed to have been a star or a plus sign, and during development the feature was referred to as "awesome" instead of "like". It was introduced on 9 February 2009. In February 2016, Facebook introduced reactions - a new way to express peoples emotions to Facebook posts. Some reactions included "Love", "Haha", "Wow", "Sad", or "Angry".
The like button is a significant power sharing tool, as one "like" will make the post show up on friends' feed, boosting the algorithm to ensure the post is seen and interacted with in order to continue the cycle of engagement.
On the other hand, a study highlights the disadvantage of the “like” reaction in algorithmic content ranking on Facebook.
Official source
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