I think online interaction has its benefits when it comes to putting together a really thoughtful, complex set of ideas and thoughts that you need to explain in a way that's clear and understandable. Often, a lot of things that you need to convey to someone can't be articulated face-to-face in the same way they could through a letter or a formal message. And even if you are able to do so, your emotions (nervousness, frustration, for example) can get in the way and hamper the message you're trying to deliver, or you can be interrupted by the other person. I guess online communication can help you say what you've gotta say in a way that's really organized, without as many other factors influencing the delivery of the message.
So yeah, I guess both forms have their merits.
Read that instead ^.