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The Facebook Like button is a social plugin provided by Facebook to other websites. When a user clicks the Like button on a piece of Web content, that Like will appear on the user's Facebook news feed, along with a link back to the Web page.
More generally, "Like" on Facebook refers to an action that can be taken within Facebook. The ability to Like is a key feature on Facebook that acts to promote social sharing and interaction.
Sites can use Like in one of two ways:
Many websites show the number of likes on a given article as a means of self promotion.