Definitely everyone who uses the Like button should have these headers... Put them anywhere in your
headinclude template.
Code:
<meta property="og:title" content="$threadinfo[title]"/>
<meta property="og:site_name" content="$vboptions[bbtitle]"/>
<meta property="og:image" content="http://www... path to image/logo.jpg">
<meta property="og:type" content="article" />
The
og:image one is the only one you need to customize... make this a URL of an image you want to use when someone likes your page, usually the site logo- but it should be "roughly" square. Facebook will resize it as needed within reason though.