I don't think you're supposed to know, since it's up to that person what they want to see.
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Facebook notifies you if someone comments on a post the same you for one reason. The reason is so that you will know what's going on and to keep you updated.
I don't know what you mean but I think you mean when you get an e-mail from facebook. Anyway I think it just says your friend has a birthday today or someone poked you and then it has the facebook logo so there are many things facebook emails you about. Hope this helped.
You can send AOL email to Facebook by linking the accounts. When you link your accounts you will see your AOL contacts on Facebook. You can send an AOL email to someone's Facebook email address and it will go to the Facebook message application.
Block PeopleIf you block someone, they will not be able to find you in a Facebook search, see your profile, or interact with you through Facebook channels (such as Wall posts, Poke, etc.). Any Facebook ties you currently have with a person you block will be broken (for example, friendship connections, Relationship Status, etc.). Note that blocking someone may not prevent all communications and interactions in third-party applications, and does not extend to elsewhere on the Internet.(this is straight from facbook.com under the privacy settings)
Why yes you can privet talk on facebook, i say the easy way to privet talk is to message them just click the persons account you want to talk to and by the poke button there's a message button click it and you will know what to do after that.