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If you post something on someone's wall ANYONE can see it. If you message them no one can see it.
Someone who either: blocked you or deleted their Facebook. But if you click their name in a message, you should be able to see there profile and re-friend-request then.
Don't delete them
There is a messages icon in the top left corner of the page.
As of now, there is no such function in Facebook. So, no.
There is no function for that in Facebook, as of now.
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.
WikiAnswers is designed for asking and answering questions, not for social networking/making friends. You can chat with other contributors on their message boards and see if they have a Facebook account attached to their WikiAnswers Profile. If both of you have a Facebook account, then you can ask to be their Facebook friend.
No, if you block someone on Facebook, they can not see any of your activities
no, they cant see anything you do, and you cant see anything they do!
Yes.You can write a message and see the time.
Nope