IT doesn't cease to exist because you are not at work!
Or, when I'm at home or out with the family, it's just way too easy to check your notifications or unread posts on your cell phone. Literally takes only as long as it does to unlock phone, open browser, refresh page... 5-10 seconds?
I like to keep up with things, and my profession, learning in the process. ML tracking helps with that. I read all threads. Just because I don't reply to most of them doesn't mean im not reading and learning through them. I'm sure I speak for others as well!