I've not explored tumblr accounts (and similar) a great deal, but nearly every single time I hit one I'm floored by the power of these individuals. And there's so many of them. Of the best and neatest ones, the range, breadth and clarity of each one's vision is stunning in look, tone and intellect. And some so young! prediction: pretty certain these are the new curators and global mini-maxi-museums.
(which also happens to be a tumblr account but I found the image via raisedonsandwiches which is the tumblr of one of my former students (from the honey class).