Zuckerberg: Facebook will shift focus to private networks instead of open ones

On Wednesday, Facebook CEO Mark Zuckerberg published a more-than-3,000-word blog post that seems to declare a major shift in Facebook's strategy. In it, he says he believes that "a privacy-focused communications platform will become even more important than today's open platforms."

Zuckerberg has announced privacy initiatives in the past, but then not delivered on them. This lengthy blog post guarantees nothing but the start of a new phase of the conversation.