I think that is okey, you can become a good friend with someone that you never have seen, but, isn't it easy, right? For example, i had a friend from Argentina, and at the first it was hard to me to trust on that person, because today you have to be careful on internet, however, we gotten good friend, we talked a lot of funny things, about his life, work and family, and, on my case, he gaves me some advices. The problem with this it was that i expected to know him by webcam or a picture and never send me anything, so i got dissapointed about it, im still be his friend, but some time ago that i haven't talked him.