With the Button, visitors can recommend your website to their friends. When a user clicks this button, the reference to your page including the link will appear in their friends news – only of course if the user is also registered with the social network.
Integrating "Like" button in MyWebsite
As a user of MyWebsite you can enable Facebook's "Like" button directly in your website editor.
Integrate a "Like" Button in another website
On Facebook you will find the official integration guide for the Follow button: