one response to his letter is to think it’s inspiring, touching, even, that there’s a billionaire out there who wants to build an “infrastructure”, a word he uses 24 times, that “prevents harm, helps during crises and rebuilds afterwards”.But here’s another response: where does that power end? Who holds it to account? What are the limits on it? Because the answer is there are none. Facebook’s power and dominance, its knowledge of every aspect of its users’ intimate lives, its ability to manipulate their – our – world view, its limitless ability to generate cash, is already beyond the reach of any government.