Online ads can be targeted in numerous ways - to readers in specific cities or to match the clients' product to readers most likely to be interested in it.
For example, an ad for a mortgage company may pop up for readers who have clicked on a story about property.
Clients also liked that they could quantify their spend with digital marketing, Mr Callaway said. For example, at the end of a campaign they can see how many users clicked on the ad through to their website. APN is also a premium partner with Google, one of only five in New Zealand.
However, Mr Callaway believes there is still very much a place for traditional advertising, with people still reading newspapers.
"Digital marketing complements traditional advertising. People's reading habits will not change in the next 20 years."
APN Bay of Plenty and Waikato marketing manager Samantha Dowling said it was great having Mr Callaway on board.
"Andrew is passionate about digital advertising, and his knowledge across both digital and print advertising means he can provide clients with tailored digital advertising solutions that are a great extension to their traditional marketing and support their business goals."