Oekaki (お絵描き) literally means "sketch" or "drawing" in Japanese. Oekaki when it is referring to the internet is basically drawing in pixels, usually done by a graphics program on the web server/website itself, uploaded to BBS and then posted along with other users oekaki. It is very popular.
I wanted to find something like Conceptart.org (which I don't I go to) and CGHub, but in Japanese language and found a website called "Pixiv" which basically, is a Japanese equivalent of Deviant art. I registered and looked at the bottom of the site and noticed there was a Pixiv chat function. Curious about this, I clicked such a link, and found myself in front of a page with basically live oekaki paint sections. So you can walk into these rooms and while you paint, you can chat with users. I think this is a big plus for me, not only because I can talk to people abroad, but I can use/study my Japanese while working on my color theory/painting skills at the same time. So yes... Oekaki.. (The bunny car is mine btw)