Finding such clips is vital to YouTube's business. Detecting use of steganography isn't vital to Facebook so unless it becomes a very public issue (e.g. is wide

Finding such clips is vital to YouTube's business. Detecting use of steganography isn't vital to Facebook so unless it becomes a very public issue (e.g. is widely used by terrorists) they are highly unlikely to integrate detectors for it. Either way, this is a marked improvement over sending private messages on the Facebook or unencrypted emails (and sending encrypted emails is a very fast way to get noticed).