The way I understood it, "Relate" is supposed to include what one commonly colloquially calls "grown-up problems" (Disclaimer: this by no means implies that non-grown-ups don't have important problems.) Also, this would include seeking and providing emotional support.
The new purpose of "Chatter" would then be smalltalk (weather thread), forum games (Mafia), discussion of pastimes which don't fit in "ENJOY" (cooking, cycling, gym thread, university/school etc).
...and now I realize this doesn't answer your question.
Also: Will there be additional age restrictions on the Relate? (I'd rather not have any, seeing as the forum, and arguably the comic, are PG-13 already).
Could we maybe have this discussion split off (and possibly moved straight into Relate)?