The term FACEBOOK BUTTON is composed of two crossword solutions, SHARE (5 letters) and LIKE (4 letters). The SHARE button is a feature on Facebook that allows users to post content from other websites or applications directly to their own Facebook page. The LIKE button is a feature on Facebook that allows users to show their appreciation for a post or page by clicking the button. Both of these features are important tools for users to interact with each other and SHARE content.