Okay this is just a random thing and I know this post is old but @howo how about not using steemit at all, maybe busy or steemspeak would allow a canonical link? Fact is, the post is going to display and get crawled on several interfaces. The content is not really duplicated on steemit busy steemspeak etc. Google just thinks every site is centralized. So it will always be dozens of displays of every steem article, and sill yet all of the blockchain sites still have great seo. I don't think it's much of an issue for seo, but if adding canonical, it may be easier to get other interfaces to add a canonical than steemit?