Flickr is both an image and video hosting site where users can upload and share. You can add notes, tags to categorise them and save images as favourites. There is the option to make your photos public, private or select which ones you wish to share with family and friends. You can view your photos from anywhere and also connect your account with Facebook, Twitter and your blog.
Instagram is a mobile, desktop, and internet-based photo-sharing application and service that allows users to share pictures and videos either publicly or privately.
Pinterest is a virtual pinboard where you can share and organise images. You can browse pinboards created by other people to discover new things and get inspiration from people who share your interests. People are using pinboards to curate reading lists, organise projects and to create team photo boards.
Snapchat is an image messaging and multimedia mobile application. One of the principal concepts of Snapchat is that pictures and messages are only available for a short time before they become inaccessible. Users can apply filters and stickers to snaps, and contribute to ‘Live Stories’.