Social media is computer-based technology that facilitates the sharing of ideas, thoughts, and information through the building of virtual networks and communities. … Users engage with social media via computer, tablet or smartphone via web-based software or web application, often utilizing it for messaging.

Social Media includes four (4) primary categories:
Social Networking (Facebook, LinkedIn, Google+).
Microblogging (Twitter, Tumblr).
Photo sharing (Instagram, Snapchat, Pinterest).
Video sharing (YouTube, Facebook Live, Periscope, Vimeo)