Math.SE has an associated chat functionality. This can be useful for lots of things - there's a general mathematical chatroom which handles lots of quick little questions; there's a moderator office chatroom which facilitates informal conversation with the moderators; there are various themed rooms focused on specific areas of math; and there's a general socialization chatroom.
Chat's moderation is somewhat different than the main site. For one, flags in chat can alert all mods from any site in the network who are currently active in chat (and some non-moderators too). Individual users who set up or maintain rooms can limit participation in those rooms to a select group if they desire using "gallery mode" unlike the main site where there is no feature that behaves exactly the same way.
There also seem to be less in the way of meta discussions around chat. For instance, the chat tag currently contains 98 questions (99 once this is posted).
How far off-topic can a chatroom go before it is considered too off-topic to be associated with MSE? Let's define on-topic as primarily or secondarily mathematical in nature or related to the functioning of MSE, and off-topic as things that are not on-topic. Some level of general socialization about non-mathematical stuff between MSE members is expected in chat - things like the weather, pictures of pets, interesting puzzle games, etc. have all been fairly successful topics in the general socialization chatroom. But sometimes chatrooms become highly focused on essentially non-mathematical subjects, like geopolitics, sport, or religion. How do we feel about this as a community?