On the plus.google.com page, wait for the little chat box to load in the lower-left. Click the tiny gray down-arrow next to the word "Chat" and click "Privacy settings". Pick "Custom" from the menu, and then only choose the circles you want to show up in chat.
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On the plus.google.com page, wait for the little chat box to load in the lower-left. Click the tiny gray down-arrow next to the word "Chat" and click "Privacy settings". Pick "Custom" from the menu, and then only choose the circles you want to show up in chat.