Social media in a net shell. Can you digg it?

What is the approved past tense of Digg, as in "I clicked the Digg this link"? Is it it dugg or digg’d? I like diggered.
Anyway, thanks to Search Marketing Gurus, we now have a simple-to-follow, beginners guide to social media sites, including Digg. Wizened veterans of the blogosphere might roll their eyes at the simplicity of the thing – and yes, I think StumbleUpon deserves a smarter description than just "sites that don’t fit a category"; I know Wikipedia does – but I can think of plenty of client-related uses for this sort of basic primer.
It deserves to be diggered.