Arrogant little boy king.
This is a major PR blunder. It's hard to imagine such attitude will make the parliament more lenient. Facebook just played a vital role in the manipulation of British democracy in one of the most important decisions in a century. But the CEO responsible couldn't care to fly over and explain himself. If what Facebook wanted was to be forgiven (or at least forgotten), and to secure more accommodating regulation, they just made that a lot harder for themselves.