One thing I'd like to point out about public sharing on the internet that some people on here seem to be unaware of or ignoring completely: once you post something into a public space, be it Facebook, Twitter, W/E, that image is considered "public use". This means that I could take a picture you've posted of yourself and add captions to it, photoshop it, ETC. and repost it as much as I want. The only thing I can't do is claim the original image as my own.