Substantive critique of Facebook is fine on HN. To illustrate the point, I used a moderation mechanism to rescue the OP from being penalized, which is why you see it on the front page now.

That said, you can't do this with an account named "markyuckerberg". We want thoughtful conversation, not cheap shots or personal attacks. Perhaps Zuckerberg needs no protecting when it comes to these things, but HN certainly does, so I've banned this account. If you want to comment on HN, a good place to start would be with a username that doesn't violate the spirit of the site, re which please see https://news.ycombinator.com/newsguidelines.html and https://news.ycombinator.com/newswelcome.html.

Btw, special-purpose accounts aren't allowed here either. We're hoping for good conversation, not pre-existing agendas.