Just your usual "all shares are equal but some shares are more equal than others" dual stock structure that is in vogue these days: Google, Zynga (ahem) and a number of other companies have them.

It still boggles the mind that the investors place such a small premium on the right to vote.

I am trying to see how one could defend this type of structure.

It is the ultimate "having your cake and eating it" deal for the founder.

MZ could build a giant money hole with FB money in Antarctica and there is nothing shareholders could do.