Also, comments are solved with WebMention. Basically, you write a post on your blog as a reply, and then WebMention is a protocol to tell their site about it. However, it seems like it will be very easy for spammers to attack, so the receiving site still should use moderation/Askimet/other spam prevention techniques.
For further actions, you may consider blocking this person and/or reporting abuse
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Also, comments are solved with WebMention. Basically, you write a post on your blog as a reply, and then WebMention is a protocol to tell their site about it. However, it seems like it will be very easy for spammers to attack, so the receiving site still should use moderation/Askimet/other spam prevention techniques.