I feel like telling someone you've never seen or talked to before that he/she is 'beautiful' takes the meaning out of the word - It becomes empty and it does him/her injustice. Yes, everyone is beautiful in their own way, but being told you're beautiful shouldn't be something you're entitled to. Rather, it should be something you earn by letting the beauty in you shine through the way you treat others and yourself, your thoughts, your actions, your behaviour, etc. I think it's nice when you meet someone and you're able to touch them in a way that they're able to see the beauty in you, exclusively. So when someone tells you you're beautiful, you know they actually mean it, and they're not just merely throwing the word out. The word becomes more special and meaningful then.