I also tweet a lot at @tankorsmash. I'm always looking to meet new people, so make sure to say hi!
Q&A for professional and enthusiast programmers
Q&A for professional and independent game developers
Q&A for computer enthusiasts and power users
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems.
Q&A for user experience researchers and experts
Q&A for people studying math at any level and professionals in related fields
Q&A for professional system and network administrators
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Q&A for professional programmers interested in conceptual questions about software development
Q&A for passionate videogamers on all platforms
Q&A for programming puzzle enthusiasts and code golfers
Q&A for software quality control experts, automation engineers, and software testers