I frequent four forums. StackExchange is where I expect intellectuals but it is a place for questions and answers--not debates. Luxury4Play is where I discuss hobbies and meet people. QuantNet is where I discuss work. Unfortunately, it's typically vague outside of mathematics and statistics and the most common topics are redundant and from people trying to become a quant.
Then, there is this site, which is a remnant of what was once a closet addiction. I joined this site long after I switched to a very casual approach to WoW--playing every expansion launch for about a month.