A fairly technical article by Clinton Forry at AListApart on using metadata (Facebook Open Graph and/or Twitter Cards) to make your content more “Like”-able on Twitter and Facebook – that is, using metadata to help Facebook (and Google+ or LinkedIn, which also use FB’s OG) content-sharing dialogs decide how to automatically populate things like title, description, and post image:

“Like”-able Contest: Spread Your Message with Third-Party Metadata

For those of us using WordPress, web designer and author Paul Jarvis shared the code he uses to inject Twitter and OG metadata in WordPress pages and blog posts.