Personally I am happy to be thought of as a friend. But if I have not spoken to you before. It be plan creepy. (People will watch me. An randomly add me to there friend list.) This is why there is only certain people on my friends list. (It does not include acquaintances.)
Also I on a tell others how high and low I rank them in my friend's list. (Best friends are hard to into.) I do it just because it is fun to see what they say.