2018-03-14 UTC
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Zegnat Quill (the micropub client) can be set-up to syndicate the reply to Twitter directly, I believe. Other people might have their CMS syndicate (e.g. Known comes with tools for that IIRC). And others might be using Bridgy Publish or SiloPub to push to Twitter after posting the reply to their own site (the oposite of backfill, using an external service to copy a local post to a Twitter post)