2017-11-22 UTC
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rhiaro When B clicks 'like', their client knows that the original note was addressed to A's followers. The client includes this information - *and* adds A to 'to' (see section 6.1 Client Addressing) on the new Like activity, which is posted to B's outbox. B's server then carries out the instructions for outbox delivery (section 7.1.1) which involves finding all the adresses in to, bto, cc, bcc and audience, discovering *their* inboxes and posting the activity on. In