Certain philosophers of mathematics are interested in aspects of the philosophy of mathematical practice. Mathematicians, perhaps, would be interested in philosophy that may affect their day to day work, as is noted near the end of Gowers's article on whether mathematics needs a philosophy.
JDH's curiosity about structuralism on a recent Bourbaki thread on MathOverflow makes me wonder:
Question: Is there an appropriate "stack exchange" for questions on the philosophy of mathematical practice?
I think questions about the philosophy of mathematics are inappropriate for MO in general, but may be interesting for mathematicians if handled elsewhere. Unfortunately, philosophy.stackexchange doesn't seem very helpful for the type of question I'm thinking of. I'm also not interested in a site that is dominated by questions targeting old foundational issues more than contemporary practice. I imagine, also, that many naive questions would populate such a forum and so am not necessarily suggesting that one would be a good idea.
I think the answer below settles the question adequately. It was not much effort, however, to propose a stack exchange for philosophy of mathematics at Area 51: