Of course you can build a relationship online. Think of all those dating sites like eharmony.com or plentyoffish.com, not to mention chat rooms and ads online. The advantage to using the internet for finding your soul mate is the amount of people using the internet. So instead of finding your mate in a big city of 1 million people, you are exposing yourself to hundreds of millions of people thereby increasing your odds of finding that right person. The internet also makes it easier to find people with common interests – meetup.com for example. People actually get married from these sites. I know of this first hand and you can ask me about it.