Social media refers to  means of interactions among people in which they create, share, and exchange information and ideas in virtual communities and networks.

The term 'Social media' is a very broad term but can be broken into separate categories:

• Social Bookmarking. ( Pinterest, Blinklist, Simpy)  Interact by tagging websites that you like and searching through websites bookmarked by other people.  You can follow friends or other people to see what they 'like.'
• Social News. (Digg, Propeller, Reddit) Interact by voting for articles and commenting on them.
• Social Networking. (Facebook, Instagram, Twitter) Interact by adding friends, commenting on profiles, joining groups and having discussions.
• Social Photo and Video Sharing. (YouTube, Flickr, Vine) Interact by sharing photos or videos and commenting on user submissions.
• Wikis. (Wikipedia, Wikia) Interact by adding articles and editing existing articles.
• Messanging (SnapChat, Line, TextFree) These applications work more as a messaging service.

See Social Media posts:

Social Media for Kids

Facebook Privacy

YouTube for Kids

Instagram

Social Media Posts