Facebook Open Graph
The Open Graph Protocol helps Facebook make better sense of websites containing real world things and shared on Facebook. So if your website represents a restaurant, you can help Facebook recognize it as such when people share the link or click “Like” on the page.
You’ll probably find the most important metadata to be the object type.
Example: Object Types
For restaurants, it’d be as simple as adding this tag:
<head> ... <meta property="og:type" content="restaurant" /> ... </head>
If you more information on your website such as events, products or otherwise there are also methods for adding those.