The following tip was provided by John Gunnar.
A lot a bookmaking services use a bookmarklet to easier save pages, and this is what you need to know:
A bookmarklet reads the source code on your web page in order to add information about a web site.
Therefore you need to add meta description: <meta name=”description” content=”"/>
The text you add, is the same type of text that appears as a description for the bookmarks on browsers and on bookmarks on social bookmarking sites.
Several social bookmarking sites like twine.com, faves.com and secondbrain.com – allow a bookmark to be followed with a thumbnail. Therefore it is essential to have a logo or a small image on every page.
Any more tips on how to make your posts social-bookmarking friendly? Please share them!