Is it normal to fall in love with someone of facebook?

ok, so i havent had a proper relationship in a few months and i usually chat girls up and sponetaniously have sex with them at parties or at festivals but recently ive met a girl on facebook she knows alot of my friends and she is very attractive. ive been talking to her via facebook for a month or two now and im starting to think about her constantly even though we've never met. i havent thought about have sex with her because shes one of those girls with morals and i respect that. so what im trying to ask is this normal?