Flickr - image and video hosting website
Couchers.org - The new alternative to Couchsurfing. Non-profit. Community-focused. Well built.
Imgur - Imgur is a free and simple image hosting service with image editing feature. Signup is optional.
Couchsurfing - CouchSurfing is your ticket to explore the world -- from the road or from your own home.
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.
Trustroots - Travellers community for sharing, hosting and getting people together.