And it's the big tech businesses such as Facebook and Google that feel most at home with the special privileges of dual-class shares, and it is around these companies that arguments flare. Facebook is a case in point. Mark Zuckerberg was forced to abandon a plan to introduce a new share class which would have split each ordinary share into three elements: one with voting power and two without. However, the company's current dual-class system has attracted the ire of institutions.