Nope I don't click log out, just close the browser, don't see the point in clicking log out as it means I have to sign back in when I come back on here.
When I was in school, my account got pwned by some friends when I didn't log out. Everyone knew my password, I didn't hide it. Bad practice I know but it wasn't worth much. Home PCs I never log out.
Never, nobody at school really cares, they usually just scoff and call me a geek or something. At home I harely even turn my computer off so bothering to log out from HWF's isn't going to happen. It's just sort of a pain to log in when you visit often.