I am new to Stack Overflow. After commenting repeatedly on an answer from somebody, suddenly a warning (automatic, I guess) popped up: "Please avoid extended discussions in comments. Would you like to automatically move this discussion to chat?"
I get the idea behind this move. Only problem: As a newbie, I can't use chat rooms. Wouldn't it be better to show this warning only, if you actually can use chat rooms?
On a side note: These automatic warning messages might scare away new users. My first posting got a warning like "Postings with these headlines are often down voted and deleted". It nearly made me leave the site. Maybe a less restrictive warning, if you are not a repeat offender, would increase the attractiveness to new members.