Usally its if your stuff starts changing or if they have deleted. Friends, pictures, ect
There is no way to know unless they leave a comment or write on your wall.
not unless they write on your wall no
Well wall to wall means when you talk to someone you can then see your whole conversation, by clicking "wall to wall" which is under the text box.
If you post something on someone's wall ANYONE can see it. If you message them no one can see it.
no
You guess
Ask them.
No body can remove your post from facebook..he can hide you post from his wall only.
Most messages are private, but not messages you post on someone's wall.
make a new profile
Post on their wall, send them an message.
By umm comments or writing on there wall or messaging