I think that yes you can become attached to someone. You can fall in love with their ideas, their writing style. But it is not more than platonic love. Because while communicating with each other on the net you only use words as in real life communication is more than with words, it is with gestures, eye contact, etc. I think that in virtual relationships certain elements of communication such as body language are missing. And so, to really form a realistic image of the person you are communicating with can not be done without all the elements in their place. So while you are in love with the person you are communicating the large part of the impression you have of that person is imaginary. You imagine that that person can be that way or this way. Any way, I think that when you decide to meet the person in real life, that’s when you will know if you really like them or not.