I am a member at DeviantArt, but I do not use it for business at all. I got it back when I was in high school... 6 to 8 years ago... and I posted some stuff I was writing then there, but I haven't used it much, and it seems to not be geared very well for the furtherance of writers' careers.
I'm definitely a member of Deviant Art! That's a great community (minus all the anime). My Deviant Art name is Melting Waves. Feel free to check out my portfolio even though I don't have a lot of work in it. I'll definitely check out yours!
Ah I need to finish uploading all my artwork to Deviant Art. That's going to take a little while...