Business and employment-oriented network, used mainly for professional networking, posting and responding to jobs, etc.

Allowed registered users to maintain friends list and share content with those friends. No longer operative

Friends networking, personal profiles, blogs, groups, photos, music and videos.

Offers a voice-over-ip application that specializes in video chat, video conferencing and instant messaging. Users may transmit text, audio, video and images.

Social network designed to help users meet new and old friends, and maintain relationships. Add youtube or google videos to profile, and create polls.

Currently the largest social network, offering friend networking, posting photos, videos and other content to profile, liking and disliking other content, timeline, news feed and instant messaging.

Friends network, photo sharing, user groups and status updates. Oriented towards gaming and entertainment.

Posting user-generated videos, sharing, liking and disliking videos, and commenting on videos. It is currently used for many types of video content including movie trailers, live streams, tv and movie clips, news videos, etc.

Offered maintaining personal websites and blogs, share photos from Yahoo!Photos, create and share a public profile and see which friends are currently online.

Offered blogging, sharing photos, music, videos and questionnaires. Friends network and sending messages and personal profiles.

Social news aggregator offering profiles, liking and disliking posts, commenting system and organizing content into boards called "sub-reddits".

Started off allowing users to send and receive small messages known as tweets. Now allows posting content including photos, videos, etc. Grouping messages using hashtags, and following other users.

Allows users to post multimedia content including photos, videos and other content to a short-form blog.

Offers voice-over-IP services, cross-platform messaging and groups. Allows users to send and receive messages, share documents, photos, location, make voice and video calls, etc.

Social network designed to enable saving and discovery of websites using images and, to a smaller extent, videos

Photo and video sharing social network which allows users to upload photos and videos and apply various "filters" and organize it with tags and location information.

Chinese multi-purpose messaging, social media and mobile payment app. It has been described as China's "app for everything" because of its wide range of functions.

Offered a user profile, including photos and other biographical information. Included a networking feature known as Circles which enabled users to be organized into groups.

Offers a multi-media messaging app with a unique feature of short-living pictures and messages.

Offers a voice-over-ip application and digital distribution designed for video-gaming communities. Specializes in text, image, video and audio communications between users in a channel.

Video-sharing social network offering short lip-sync, comedy, music, talent and reaction videos.