[StavrosK]

What's the point of that? I just tried it, and I can take a screenshot fine with one finger on the screen.

[wlesieutre]

It used to be that taking a screenshot briefly stopped the touch event, so it could notify the sender when you took a screenshot.

iOS 7 fixed that bug, but added an official way for apps to detect screenshots. I would guess snapchat has just hung on to their old interface out of tradition, since it still works. It just doesn't have anything to do with screenshots anymore.

[StavrosK]

Ah, that makes sense, thank you.

[gaius]

The point of it is to reassure unsophisticated users.

[samolang]

It also attempts to notify the sender if the receiver takes a screenshot of the message.