Rob Butler wrote: "As admin of one of the biggest Whangarei buy sell swap pages we try our best to protect people.
"People need to be smart before making deals. Don't hand over money before you see the goods and don't hand out your address willy nilly. Be smart and take responsibility for your actions."
Jan Butler, the admin of an online selling Facebook page, said she had had no experience of similar fraud herself, but she approved posts before they got to the page to help avoid fraud.
She said it was up to buyers to be suspicious of everybody, as admins of buy/sell pages could do little to stop it happening.
"[But] the scammers don't hang around long, so as soon as they get what they want it's deleted, and within minutes [they are] up and running again with [a] new profile."