Facebook Likebox encourages visitors to like your website with a prompt lightbox. The lightbox lets them easily become a fan of your Facebook business page by hitting "Like" while also displaying your total likes and pictures of others who have liked your page. In addition, you can add a custom message to the top of the lightbox to help encourage visitors to like your page.

Note, it is against Facebook's policy to force users to like a page to view it, so users are able to close this lightbox without liking your Facebook page.