In recent years, visual medium has exploded on the internet. Older social media services such as Twitter and Facebook have made changes to accomodate pictures and new services have developed that are exclusively designed for visual medium.
Condensed from Wikipedia -
Pinterest lets people use to collect ideas for their different projects and interests. People create and share collections (called “boards”) of visual bookmarks (called “Pins”) that they use to do things like plan trips and projects, organize events or save articles and recipes.
Instagram is an online photo-sharing, video-sharing and social networking service that enables its users to take pictures and videos, apply digital filters to them, and share them on a variety of social networking services, such as Facebook, Twitter, Tumblr and Flickr. A distinctive feature is that it confines photos to a square shape, similar to Kodak Instamatic and Polaroid images, in contrast to the 16:9 aspect ratio now typically used by mobile device cameras. Users are also able to record and share short videos lasting for up to 15 seconds.
Snapchat is an image messaging and multimedia mobile application that lets users share images that are explicitly short-lived or "snaps" - a photo or a short video that can be edited to include filters and effects, text captions, and drawings. Snapchat offers a mix of private messaging and public content, including brand networks, publications, and live events such as sports and music.