call-to-action

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Call to action in web design — and in user experience (UX) in particular — is a term used for elements in a web page that solicit an action from the user. The most popular manifestation of call to action in web interfaces comes in the form of clickable buttons that when clicked, perform an action (e.g. http://www.smashingmagazine.com/2009/10/13/call-to-action-buttons-examples-and-best-practices/

Call to Action Buttons: Examples and Best Practices « Smashing M

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http://developers.facebook.com/docs/reference/plugins/like/ standard - displays social text to the right of the button and friends' profile photos below.