Proposal: Social conventions and interaction
Social conventions and interactions seems like an excessively long and complicated name for what already has a perfectly suitable term in widespread use: etiquette.
etiquette.stackexchange.com would be a site for people to ask the types of questions that would have traditionally gone in Emily Post-style etiquette books or--at the more banal end of the spectrum--in a syndicated newspaper column like Dear Annie.
A site like SE seems perfect for this type of discussion because although there may be confusion about and/or inconsistent convention wisdom regarding a particular topic, most etiquette questions do have a right answer, and any major topic is likely to be supported a body of writing on acceptable social decorum. That said, mores change and a website--unlike a book, even an electronic one--is more easily adapted to these social fluctuations.