Well, I know that there are philosophers who have treated the ethical issues of eating animals (Peter Singer being the most famous contemporary example). But my impression is that vegans aren't acting based upon some philosophical work, but rather an intuition that eating animals is "wrong". So if you want to ask a philosophy question, it helps to identify philosophers who argue for veganism and ask about their views; otherwise, you are asking a question about contemporary human society, which is the domain of some other part of humanities and social science
Where lies the distinction between whatever ethical issue I am thinking about, and something "philosophical" that is on-topic for the site? For example, from the Wikipedia article on Philosophy:
In more casual speech the "philosophy" of a particular person can refer to the beliefs held by that person.
On the other hand, the FAQ states:
But please keep in mind that some questions are still too informal and well-trodden to be a good fit for this site (e.g., "What is the sound of one hand clapping?" and "What is good and what is evil?").
but the FAQ doesn't go on to define that very well. How can I tell if a question related to beliefs or ethics is on-topic or not? I didn't really find a clear answer in the community FAQ either.