I think it might be OK if the problem is posed as a general problem from which everyone can learn. But in past week or so I have seen people posting the question with multiple choices (a), (b), (c), (d) -- I think the poster is making no effort whatsoever. I have posted some answers myself -- but I don't know if I am really helping anybody (I guess I am helping myself to 3 points?). I think the situation could be worse if these questions are a part of "take-home" exams where outside consultation is not allowed.
On the other hand >99% of the posts don't fall in this category.
Best regards,
v_c