Hiding or censoring part of an image through obfuscation is as easy as selecting the area in Photoshop and applying the Pixelate->Mosaic filter, but what if you don’t have an image editing program at your disposal? If you’re seriously paranoid about your privacy on the Internet, there’s a new service called PhotoHide that helps you quickly add these pixelated areas to any photo. Everything is done through the web browser, and you can download the final image once you’re done.
Doing this to every single photo of you on the Internet would be ridiculous, but you might find it useful for more reasonable applications (e.g. hiding your house or license plate number in a photo).