I understand (or rather: I hope) the OP was speaking in jest, but in honour of the #KTCRIM I will respond in seriousness to promote discussion.
There is a massive distinction between “mingling freely and conversing with whomever they please” and posting on the Coffee Room. Mingling and conversing are the first steps to familiarity, loosening boundaries and lack of reserve, and therefore prohibited between unrelated singles. Besides for the fact that anything public is automatically less intimate, and therefore less likely to cause any awakening of improper feelings or improper behavior, there is a second difference which makes the Coffee Room unique.
A normal conversation is merely a platform of communication between the participants. The mere fact that you are conversing creates a connection, and at least for the duration of the conversation, you are equals, you are friends, and there is a [albeit weak] emotional bond. You can be talking about nothing of importance, but it makes no difference. You can instantly strike up a connection with someone by discussing the price of milk in a grocery queue; even someone you have never met. (Obviously, something digitalised has less of that, due to lack of eye contact, body language and other factors that are credited to the visual aspect of the conversation)
?? ?? ???? on the Coffee Room. The fact that it isn’t instant, and the fact that everything is carefully moderated means that you aren’t really having a conversation with another person, you are just having a conversation about something. Pretty much anything personalized about the conversation is removed; the entire conversation is only what is said – not anything more. The conversation has become a discussion limited to the topic of discussion rather than a springboard for familiarity.
Therefore, by definition, there is no “mingling” happening, nor any casual conversation. Everything is simply WYSIWYG.