Good advice. It might be a while before I have anything I'd want to add--longer still before I have anything I'd want on a permanent resume--but this is still useful information. I'm saving it to my collection of resources.
This is a really helpful article and something I've never thought of before. I've been writing poetry on dA for years, and I constantly get friends and/or family members (in both my real and virtual lives) asking me "why don't you write for money?" or "when are you going to put that poetry book together?" I never really know what to say because my stuff is essentially up on the net for free.
I don't disagree that any writing experience, especially in a critique-based community like (some parts of) the dA literature community, is valuable to a writer--it does "hone your craft" and usually contributes to your growth as a writer. But I don't think I necessarily agree that it belongs on your resume outside of a "personal interests" section (which I don't include on my resume anyways).
I guess it very strongly depends on exactly what kind of work or position you're applying to, but I can't think of a situation where I would feel that it's appropriate to speak about my internet writing career as actual experience. You can take a look at my deviantART page--I have many lovely friends who all like my work to some extent, but it's difficult to say that that proves my worth as an author.
You've written in another article that "you need to be successful to be successful", and that's true. While I'm absolutely thrilled to have deviantART watchers, employers and especially publishers see these things in terms of cold, hard numbers--and I hate to say it like this, but the numbers of the average person reading this article will not be significant.
Your advice here could be good for someone with twenty-thousand followers, but not for two hundred or even two thousand, and I think that's misleading. Looking at the examples you gave, and thinking from the perspective of an agent or editor, I'm thinking "that's nice..." and not much else.
I apologize if my tone was harsh; I'm in a bit of a hurry and trying to word my sentiments properly is proving to be difficult. But I hope you understand some of the concerns I have about this article.