If you shoot them a tweet, they’ll typically reply. The only ones that seem to get ignored are the antagonistic posts that don’t seem to serve a purpose to answer anyway.

Anyway, if you follow them, they’ll follow you back and they’ll answer questions if they can.

I don’t know it for a fact BUT I believe that most responses to tweets are from Mark.

Sure there’s always email, but that’s more if you have a long question or several questions right? If it’s super quick and just a typical query and you use Twitter whoever it is, they respond quickly enough.