I have a couple friends who've met and married that way.
I'm in a LDR right now but it's with someone I've known for 3 years, however the relationship only started a few months ago once we met up again online. We talk through email almost every day and at least an hour a day on the phone, plus see each other every 2 months (I fly there or she flies here) and we're absolutely smitten with each other. In some ways it's the best way to get to know someone, at least their moody side

but in other ways it's the hardest thing and can be lonely, but it's what we have to do for now and since I sincerely love this girl it's what I'll do until she moves here next summer!