Not only is this huge by itself (600 million users with E2E encrypted messages by default), but I'm <i>hoping</i> this will put a big pressure on Google, Microsoft and others to adopt TextSecure's protocol (or something very similar), too.<p>This is how you deliver strong security to the masses. Not by convincing all your friends to adopt some weird and obscure chat app with the only benefit that it's "more secure" (most won't care), but by getting large service providers to adopt it and push it to hundreds of million of users without them even noticing.<p>Oh, and I assume that if Whatsapp adopted it, Facebook Chat isn't too far behind...right?