[golden_apples]

It's not issue of being held accountable for something they said:

http://www.vice.com/en_ca/read/cowards-are-blackmailing-youn...

Its an issue of protecting users who are using apps like these believing their privacy is safeguarded.

Whether this problem can be fixed with a technological solution, rather than a more dramatic social change, is doubtful, but since the can of worms has been opened, its worth trying.

[npsimons]

I don't deny there are issues, but they are societal/educational ones. People need to learn that when you send someone something, that's it, it's out of the bag, even if you trust that person. Due to backdoors, security holes and just general warrantless wiretapping, there's almost no way you can guarantee that what you send won't be snooped by a third party, sooner or later. Add to that that people are far too trusting, and society is sick (between treating sex and nakedness as "dirty" and misogynistic predators like the ones mentioned in your link), and yes there will be problems. But things like ShotBlocker won't solve the problem, it will only exacerbate the already tenuous control people have over their property (what right does anyone have telling people they can't make screen caps on their hardware?).

No, it's not worth trying, because a) it won't work, and b) it will have unintended consequences.