iOS: Photo Stream is a great way to backup and make your iPhone photos accessible from anywhere, but OS X Daily points out that it also has a built-in setting you might have missed that turns your Photo Stream into a publicly available web site.
First off, the process requires that you have iCloud turned on. From there, just hit the “Photo Stream” button in Photos, tap the blue arrow next to a photo album, and the flip the “Public Website” switch to on. When it’s done, you can grab the URL and share it with friends. The nice thing is that you can control which photos get uploaded this way, and it’s easy enough to quickly turn off the feature if you decide to.