This ship is more commonly known as Septiplier. This is also a very popular YouTube ship, since a LOT of people love these two, especially together. There's some moments of them that any Septiplier shipper would know. They do a lot of videos together and sometimes pretend they're dating for the sake of the fans. Also, one time Jack proposed to Mark in front of a big audience that was possibly on TV. Mark declined, as the proposal deal was for them to share subscribers with each other.
CANON: NO
REASON: Both have girlfriends