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XKCD Forums have been breached.
https://www.vice.com/en_us/article/vb5v7d/xkcd-forum-data-breach
If you signed up for echochamber.me/xkcd and reused a password... go change that password on every site you used it on.
In fact, if you've reused any password anywhere, go change it on every site you used them on.