In order for a better experience when sharing a link over Facebook (and not only there) it would be nice to have the Open Graph protocol in a page.
For example for https://bicycles.stackexchange.com/:
<meta property="og:title" content="Bicycles - Stack Exchange"/>
<meta property="og:type" content="forum"/>
<meta property="og:url" content="https://bicycles.stackexchange.com/"/>
<meta property="og:image" content="http://cdn.sstatic.net/bicycles/img/logo.png?v=123"/>
<meta property="og:site_name" content="Bicycles - Stack Exchange"/>
<meta property="og:description"
content="Q&A for people who build and repair bicycles,
people who train cycling, or commute on bicycles"/>
and not only there
part :) - but nevertheless, I changed the link url.