I think that meeting people online is a perfectly acceptable way of doing things... my brother is to be wed this July to somebody that he met online, and there is certainly nothing wrong with either of them.
That said, I've never done it myself. I mean, I've met scores of people from tennis board, but never with romantic intentions. Just to watch tennis or whatever. I don't have any plans of meeting people with romantic intentions either. But never say never - sometimes it works out for people