I've never fallen in love online. I've fallen in love with someone from the internet but the actual falling was really like after talking on the phone and getting to "know" them as best as I could in spite of distance.
I think the real aspect of falling in love takes a long time though...I think I am currently falling in love every day.
We talked for ages online, then once on the phone and then lost touch for ages and then when we started talking again on the phone things were just pretty ****ing obvious and I started to fall....
I'm very happy.