Social media is the collection of online communications or channels dedicated to community-based input, interaction, content-sharing and collaboration.
This includes:
1)Sharing links to interesting content produced by third parties
2)Public updates to a profile, including information on current activities and even location data
3)Sharing photos, videos and posts
4)Commenting on the photos, posts, updates, videos and links shared by others
Example: Facebook, Twitter, Google+, Wikipedia, LinkedIn, Reddit, Pinterest and many more.