Imgur is the only- and I mean ONLY- unlimited storage image hosting website which is totally FREE. That's my main reason for using it.
I use it to host images for my websites, and for hosting images I post on forums and stuff, but mostly I use it to back up my photos into my private folders which are named after my computer's folders so I have everything safe. It's fast, simple, free, and unlimited, and it doesn't get any better than that!
The comments and featured images are often a little on the weird side but I'm not one for social media and don't care and don't look, so I'm quite happy. Five stars, 10/10- what are you waiting for! Grab an account!