my fiance and I use whatsapp, viber, tango and Skype as well as email. we uae Facebook rarely oh and now we also use BBM which used to be BlackBerry users only but now it is also for Android and iPhones and we talk 3 to four times dAily.
I read your post and all the replies. This is the biggest concern for me. ALL couples fight. If you haven't yet, then I believe you are still in the puppy love phase where things are wonderful and everyone is on best behavior.
You do not seem 100% on this whole thing as indicative of you coming on here and looking for advice from strangers. That in itself is enough to slow things down. I truly believe if you know you know that he is the one for you. You do not seem 100% sure.
Good luck