Link previews allow your readers to preview the content on your page before they click through to read the post. Many users like them because they look good and they highlight their content well. There are several elements with link previews that you should be aware of.

1. Thumbnails - Facebook's link previews can include either small or large page thumbnails. The thumbnail that is displayed will depend on the page and device you are using. For example, on personal Profiles, link previews will always include the small thumbnail. In the News Feed or on business Pages, the large version of the thumbnail will be displayed if your image is large enough (more on this later). A best practice here would be to always use large images with your posts. Facebook will create better previews if your image is 400px wide or more.
2. Link Titles - This content will usually be pulled from your page title unless otherwise set in your blog or plugin. We will cover some options on this in a bit.
3. Link Descriptions - A description of the content on your page.