For example, could I ask a question here about how to use Arduino features in http://circuits.io?
1Isn't that interesting! I just discovered circuits.io a couple days ago.– user27783Oct 30, 2016 at 14:10
1Feel free to come and ask me a question here– user27783Oct 30, 2016 at 14:10
I don't see why not. As long as the question isn't about how to use the simulator itself (they should support their own product in that respect). Bear in mind that simulators don't always mimic real life hardware. Exact timing constraints, and marginal voltage levels might not be reproduced in the same way that real electronics would.