One of my best friends met her boyfriend, who she's still dating, through Deviantart and they're still going pretty strong. In an age where Skype is pretty much universal, I think it's definitely doable. It probably helps that they're both pretty shy people who don't really need sex, so I think it really depends on who's looking for a relationship and why. They're not in a relationship for social status among their friends, or because they want each other's bodies, but because they get along really well and teach each other things about themselves. Someday they plan to meet, even though they live on opposite sides of the country, but it's been going pretty well so far for them.