A programmer by profession, heavy stackoverflow user (mostly readonly). I try to answer network related questions, so I am more active on serverfault and unix.
Q&A for system and network administrators
Stack Exchange Network staging zone, where users come together to build new Q&A sites
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
Q&A for professional and enthusiast programmers
Q&A for computer enthusiasts and power users
Q&A for meta-discussion of the Stack Exchange family of Q&A websites