How to get more Facebook likes, shares and comments

• Add AddThis, http://www.addthis.com button to your page. You can add Facebook share button instead, https://developers.facebook.com/docs/plugins/share-button/. However I would recommend to put Addthis-button on the home page because then the user can select social media of his/hers choice. AddThis standard script is for share, they also have like button to add, http://www.addthis.com/social-plugins/facebook-like-button. You will then get the like statistics in you AddThis analytics. A big benefit with AddThis is that you also get analytics with graphs and etc.
• Your ranking in Google is a major factor. You can use different SEO techniques to increase your Google page ranking.
• The more popular your site is and the more visitors you have the more likes and activity your site will have on Facebook as well. So in general you can use different internet marketing strategies to increase number of visitors. For advertising you can for instance use Google Adwords or different affiliate networks like Tradedoubler and etc.