I have a WordPress.com account/blog. But when I want to leave a comment on someones WordPress.org blog I get ERROR: Invalid username. What is going on here
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So-called wordpress.org blog and the wordpress.com platform have no common backend (and therefore no single sign-on option). In general, you don't need to login to leave a comment on a wordpress (.org or .com) blog, but, if a particular blog requires to be logged in in order to leave a comment, you'll have to get a username and password from the blog admin of that particular blog.
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