It happens for me in the face to face meetings or emails that my friends ask me about some mathematical questions that I don't know their answer. In such cases I sometimes ask their questions on MathOverflow and reply them with the answers received from MathOverflow users, but I don't know if this is morally correct or not?
Is it good to ask somebody else's question on MathOverflow?
Is it good to reply one's question with answers provided from MathOverflow users without informing them about using their answers?