2014-11-09 UTC
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fiatjaf example: I read an article at some webpage that does not support webmentions (it doesn't have to be a personal website or a blog, it can be any webpage), I comment about it in my website, with a link to the commented page. my CMS sends a webmention to this webmention hub, or to various different webmention hubs. the person whose website was commented can later go to this webmention hub and see if someone commented about his website.