A viral post is circulating on Tumblr that includes a racist message concerning a 'GNAA video' post.
USA TODAY's Tumblr account was among those affected.
"There is a viral post circulating on Tumblr which begins 'Dearest Tumblr users,'" a Tumblr spokesperson said in a statement. "If you have viewed this post, please log out of all browsers that may be using Tumblr immediately. Our engineers are working to resolve the issue as swiftly as possible. Thank you."