Basically, social media is the general term used to describe the various ways people (and I suspect my cat) engage with each other and gather / share information online via things like blogs and microblogs, Twitter, LinkedIn, Flickr, YouTube, social bookmarking, and online communities.
The social media you are using right now is this blog which could also be called a micro internet community. Possibly you got here through FaceBook or StumbleUpon or LinkedIn or one of many other online communities. And possibly you will share this elsewhere online. That’s all social media.
More About Social Media:
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