How many people see your post on Facebook really?

Have you ever though, how many people saw your post on Facebook?

Well you can google it, or if you use AOL, Bing or another search engine.It is really interested to see the dream world Facebook have create to its users.

User content visibility on Facebook

Users often think, the whole world see post of them on Facebook. If it is the case, why does Facebook require with its boost payment?

What can we learn from the graphics below?

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