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My Tumblr and Twitter accounts are linked, so anything I post there is sent to Tumblr. The best way to hear from me would be from Tumblr. (I haven't updated my Twitter picture in years, I only use it for the Olympics and Big Brother)
Drawcrowd is more appealing to me as an alternative uploading site (for gallery purposes) that pixiv, but if people want me to use that more, I will. (Right now there isn't much on either of them, I just made them)