[AnabeeKnox]

It's astonishing that it's as simple as CATting a zip file to the end of a jpg. I feel there are consequences here for any website that accepts image uploads.

[MaxBarraclough]

> I feel there are consequences here for any website that accepts image uploads

Steganography can be done even without file-format hacks; all that's special about this hack is its simplicity.

It could easily be defeated -- I'm sure Twitter would have no trouble sanitizing uploaded image files if they wanted to.