ShoeBox - Free unlimited photo storage, so you can rediscover your photos anywhere. Available for iPhone, iPad, Android, Mac and PC.
Flickr - image and video hosting website
Google Photos - All your photos are backed up safely, organized and labeled automatically, so you can find them fast, and share them how you like.
Imgur - Imgur is a free and simple image hosting service with image editing feature. Signup is optional.
Snapchat Memories - Save and search for snaps on Snapchat
500px - Connect, get inspired, and grow your skills.