I’m sure they’ll be completely transparent and absolutely vigilant, whatever they come up with. There’s no way they’d ever use their platform for personal gain when it suits them. Zuckerberg is definitely the guy to trust when it comes to communications, especially private ones!
What I love most, though, is that Zuckerberg contrasts the push for private communication channels with “today’s open platforms”—e.g. Facebook. In what world is Facebook an open platform? Only in his.