Yes, I have done that quite alot, thats what facebook is for. I just hate when people are using face book but does not have an image.
No I don't. I use facebook just to connect with my friends and family, not to make friends with people unnecessarily whom i cannot even trust!!
Of course not, I don't know them. My facebook is sort of like my only online thing that doesn't have to do with my online stuff. I prefer keeping it private & only having real friends / acquaintances in it, it's like out of the question to add people I don't know offline. I don't use my Facebook for ewhoring, advertising, business & whatnot. I have a Facebook page for my site to do that.
If someone add me and I dont know whose them.. I will add them and see his profile, pictures, and after that, I will remove them from my friend.