Within hours, two members spotted her car 29km away in the Westgate McDonald's carpark. Piper called police and arrived at the carpark around the same time as officers a few hours later.
When told of Piper's success, Netsafe's chief technology officer Sean Lyons warned people might take the law into their own hands once their stolen goods are found.
"Lots of people are frustrated when their car's been stolen and some people want more - they don't just want their car back they want people to pay. Just because we have the information doesn't mean we should be taking the law into our own hands. It's great as a society we're banding together but perhaps we should see it as we're helping out the police, not helping each other."
Waitemata policing development manager Kerry Kay says social media is proving very helpful in helping track down stolen property.
"We (police) also have our own Facebook pages, which have been very successful."
There are similar pages including ones for stolen vehicles in Christchurch and Dunedin as well as ones for the entire of New Zealand and entire of Australia.