Nintendo has announced that the browser-based version of Miiverse now allows you to share your posts on a variety of social networks including Twitter, Facebook, Google+ and Tumblr. The update has also seen an icon added to the post screen to let you share your posts easily and quickly. Sadly this functionality isn’t built into the Wii U version of Miiverse, but it may come at a later date. As for the Wii U version of Miiverse the thumbnail for screenshots attached to posts and comments is now larger.
Thanks, Kallum and Adam