FWIW, there is also
www.imgur.com as well, I've used them for like four years now.
Very easy to use, they have apps for android and iOS, and they have a very nice image editor for touching up images.
They have free and paid accounts. With the paid, you get more thumbnail sizes, you can see more of your gallery (you can post as much as you like for free, but there is a limit on how many you can actually see in your account), other fun things.
It's $25 a year for paid. I pay $12.50 twice a year so it's a smaller hit. Quite well worth it if you post a lot of images, IMHO.