Is there a way to add a twitter and facebook link to my pages on my smugmug site?
Sure it's pretty simple. You can add some code like this to your Footer box, Advanced Customizing Page (found in your control panel, customize tab).
You can get the FB icon from facebook.com or simply google for it. Twitter would be done the same way. If you want to get fancy, they can be positioned side-by-side, and placed most anywhere on your page. Go to Dgrin's customizing forum for this advanced customizing.