45. Are there limits on online media advertising spending in relation to election campaigns?

"3D Meaning of publish
In this Act, unless the context otherwise requires, publish, in relation to an
election advertisement, means to bring to the notice of a person in any manner—
(a) including—
...(viii) disseminating by means of the Internet or any other electronic medium"

Section 3D, Electoral Act of 1993. 

But regular publishing procedures apply also explicitly to online media.