Best way to create a Facebook Follow button on nodes
Facebook Subscribe Button


  This module will automatically add the Facebook code for Facebook
  Subscribe button which will be displayed in the block and each page
  node. 





  
  Administrators can also control which content type(s) the Facebook Subscribe button will or won't appear on, as well as which role(s) are
  allowed to view the button (regardless of whether or not the user is
  logged into Facebook at the time).
  Along with a Subscribe button appearing for each node, there is an optional block that can be set to appear on each page.
  By default, the button will only appear on a node's "full" page view. This option is also customizable, however, so that the button(s)
  will show up on teasers as well.