Canberrans were surprised and concerned to learn their addresses appeared in a phone app used by same-sex marriage opponents to target undecided voters.
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Among the features of the "Freedom Team" app, launched Wednesday evening, is a tool that maps the addresses of people the Coalition for Marriage says have not yet engaged with the campaign.
"The app will provide turn by turn directions to your nearest neighbour who is yet to hear from the campaign," the Coalition told supporters in an email.
"And it will give you talking points for when you get to the door."
One Griffith resident targeted as an "undecided" voter was perplexed to learn his address was listed by the app.
"My views are that I wish the whole vote would go away," he said.
"We've been sent nothing at all by this outfit. I've got no idea why they are targeting us, we've already voted yes."
Another resident from the suburb of Campbell said he was worried about the privacy implications of his name appearing on the list.
"I haven't voted yet, but this tactic wouldn't work on me," he said.
"The whole privacy thing is worrying me. It's definitely a problem."
It was not clear how the list of addresses was generated, although the Coalition for Marriage said data came from the Australian census and the government's freely available Geocoded National Address File.
The app was developed by the American company Political Social Media LLC, trading as uCampaign, which built apps for Donald Trump's presidential campaign, Brexit's "Vote Leave" and the powerful National Rifle Association.
Fairfax Media sought a phone interview with the Coalition for Marriage but received a written response which said the group was "leaving no stone unturned" in its efforts to reach millions of Australians.
"Our campaign uses publicly available, open source data to map out our field campaign so our army of Freedom Team volunteers can speak to as many as people in the short time we have," said spokeswoman Monica Doumit.
"With so many fundamental freedoms on the line, we have no alternative but to run the most technologically sophisticated campaign in Australian history to ensure those freedoms are protected."
Both sides of the same-sex marriage debate have undertaken activities that some deemed to be invasive.
The "yes" campaign sent out text messages reminding people to vote, while Australian Conservatives leader Cory Bernardi has paid for approximately 1 million robocalls.
Australians who sign up to the Coalition for Marriage app are also liable to have their data shared with third parties.
According to the app's privacy notice, any personal information provided by users may be shared with other organisations, groups, causes, campaigns and clients "that we believe have similar viewpoints, principles or objectives as us".
Privacy experts in the US raised concerns about uCampaign's Trump app last year.
American Civil Liberties told NBC News: "It's not just to pay with your privacy, but to sell out your friends and colleagues who are in your contact list."
