Don't forget that http://hnofficehours.com exists as a way to let people get ahold of you and to indicate when you're specifically available to chit-chat. It also helps in finding people with specific skillsets.

Disclaimer: I worked on hnofficehours with ezl and guz.

http://hnofficehours.com/search/ if you want to search for a specific subject/skill to discuss with someone. You register for the site using your existing hackerne.ws account like hnhackers.