When you include your website URL in a Facebook status update or post, Facebook will automatically identify the URL and hyperlink it.
You can also request a thumbnail image to show next to the website URL too, here's how to do this with HTML Egg.
These instructions also allow Pinterest to grab the designated images from your web page.
1. Launch the HTML Egg app and open the web page you wish modify
2. Open Page preferences and paste the following code into the "Custom Header Code" field