[enigmango]

Note that some phones do mirror the front-facing camera view (though actual photos taken are not mirrored) [0]. Both my Nexus phones have done this, so I assume it's a common Android feature. I don't know about iPhones.

Regarding webcams: Hangouts also mirrors your camera to you during video calls. [1]

[0]: https://www.quora.com/Why-are-selfie-pictures-mirror-images-...

[1]: https://productforums.google.com/forum/m/#!topic/hangouts/Ia...