Facebook, social networks and privacy. Do not worry too much.
A friend writes:
DID YOU KNOW Type your FULL NAME ON THE INTERNET OPS ...
you view all your comments made on other sites ... well ... a long time ago?
to you know ...? 
And I say:
Yes, I know, and in theory everyone should know, because if you write something is because ... Show All is the belief, not good at writing "case" or badmouth inappropriately. Among other things I do not see all the concern these days for "privacy" of users. If one writes or publishes something on a bulletin board, why should the reader care about? If something is private and only directed a few, should be sent via email, though not published ... Often people use technology improperly.
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Facebook has its advantages and disadvantages. You have to be careful and take the first, protecting the latter.
From the point of view of digital marketing certainly the potential is vast.