Mark Cuban is available through his company email address, firstname.lastname@example.org. As this is a public email address, there is only a slight chance that he personally reads the emails that flood into this mailbox.
Mark Cuban is the owner of many different business ventures, the most notable of which is the Dallas Mavericks of the NBA. He is also owner or part-owner of Landmark Theatres, a chain of arthouse cinemas, Magnolia Pictures, a film distributor, and AXS TV, a satellite-based television station. His Twitter handle, which he is active on, is @markcuban. He has a public figure-verified Facebook account located at the address, www.facebook.com/markcuban.