2014-11-29 UTC
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@aaronpk @sil There's been some discussion about that on the webmention page: http://indiewebcamp.com/Webmention#proof-of-work_addition_to_webmention_to_help_avoid_spam (http://aaronparecki.com/replies/2014/11/29/2/webmention) (twitter.com/_/status/538811165778784256)