> Also, I added the Hacker News circle on G+, and all of the sudden I have 1704395784390582430 contacts in gchat. mother eff.
While it's semi-annoying that people in your G+ circles get added to gchat by default, you can easily disable this. https://plus.google.com -> click the arrow by your name in contact list -> privacy settings -> change to "custom" and disable any/all circles you don't want on your gchat list.