You're not wrong, but the fact remains that Facebook and Zuckerberg should be accountable to the nations in which they operate. Parliamentary Committees are one

You're not wrong, but the fact remains that Facebook and Zuckerberg should be accountable to the nations in which they operate. Parliamentary Committees are one of the mechanisms the UK uses to investigate and hold organizations and people to account. By refusing to appear, he encourages nations to use other powers to discover information, which we saw earlier in the week when documents from Six4Three were siezed by Parliament. It's important that it's Zuckerberg because the buck stops with him. When other executives appear they can just pass the parcel up or down the heirachy or claim they have no knowledge of what they are being asked about.