Cameron wants increased spying powers on you!
So what does that mean on a day-to-day basis? Cameron doesn't like the fact that certain messaging apps are encrypted, which means your messages are private and the PM wants to be able to see inside them, y'know, just in case you're a terrorist. So if you use Snapchat or WhatsApp, they could end up being blocked, nationwide.
Apple's iMessage and FaceTime also have encrypted data, which is no good for a man who wants to increase surveillance and revive the Snoopers Charter, which helps the government to peer into your internet goings-on.
Cameron said: "In our country, do we want to allow a means of communication between people which we cannot read?" The answer for most sensible people is 'Yes, actually.' Of course, there's going to be some people saying 'I don't care - I'm not doing anything wrong so why should I be bothered that someone's looking at my boring messages?' To those, we admire your belief that government officials won't end up losing all your private messages and them ending up online or, indeed, misreading some joke you made which sees you getting called in for questioning.
The short version is this: Are you happy with a Prime Minister who says that there should be no "means of communication" which "we cannot read"?
Of course, companies like WhatsApp are committed to keeping their services encrypted and unreadable by authorities, which is something that has become a real point of principle in the aftermath of Edward Snowden's claims about NSA surveillance.
Privacy groups are, as expected, angry at the idea of governments being able to snoop around your private correspondence, so this is a row that's only going to get louder in the coming weeks. There's an election afoot, so we'll have to see how Cameron plays it.