1) Doing something that can't be done by hand, OR 2) Replacing repetitive manual work, this saving time in the long run
IMO there's nothing "cool" about a hack that will only be used once and could be replaced by Mark (or anyone standing nearby) pre-typing the message and then posting the status to Facebook seconds after he pushes the Nasdaq button.
You could also argue that it might have been an opportunity for the engineers to learn something, but IMO you could think of more worthwhile hacks to learn from.