2016-01-15 UTC
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Loqi singpolyma: petermolnar left you a message on 1/13 at 6:19am: pingbacks _were_ are widely supported. Nowadays they are widely ignored or considered spam. It'd need additional magic to support types - like, fav, reply, repost, etc -, and by a short research, none blogger or blogspot supports it (any more?). The support you're referring to is long gone, maybe except for WordPress where it's ignored. http://indiewebcamp.com/irc/2016-01-13/line/1452694774920