You can add facebook, twitter and other sharing icons to your pages and posts.

You can add a facebook likebox widget to your sidebar. (Sorry, no support document for that, but go to appearance > widgets and you can add it and enter your information. The like box has to go to a facebook page.

You can add RSS links to your sidebar using the RSS links widget.

You can also add a facebook badge to your sidebar.

You can add additional badges using the image widget, or a text widget and code your own.