personally, if I genuinely like a woman. chances are I wont have her as a "friend" on the internet either. you might think its weird, but I don't care.
This site is the only connection i have to social networking. And i cant even call it that because im not too social here. i kno too much about information and intelligence gathering to refrain from being a part of it.
Nothing wrong wit telling her that. She should respect it. If she got mad about it, its probably because she wanna be up in your business.