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It's rather like Twitter which you could follow someone or perhaps be followed, it is not a reciprocal relationship off of the bat in fact it is all to easy to decide whether your followers can easily see your posts or not.
Linked - In is less social networking as well as a a bit more social networking. Online social networking networks have tools to aid events, for example on Facebook Business Pages there is a tab for events, and on Google+ you can find Hangouts for live video events.