What does a reply with +1 mean here on SDN?

[Dr. Bronner]

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What does a reply with +1 mean here on SDN?

 

[Doctoscope]

It means "also me." If someone says they got a secondary and someone replies with +1, it means they also received a secondary (this also applies to any +n response; some people will reply to the +1 with +2, and then as +3, and so on to tell people they also received a secondary).