The group, who call themselves Guardians of the North, pose as young children online to lure and expose suspected child abusers.
On Sunday (July 3), footage was uploaded to social media, claiming to out a 47-year-old man from Driffield who travelled to Sunderland to meet an underage girl.
In the video, that has been viewed more than 53,000 times on social media, a member of the group tells the man: “You know what you’ve done wrong, don’t you?"
The man responds: "I just knew this would happen to me.
"I wasn't going to - I wasn't going to do it."
The man is then presented with a record of the conversation he is alleged to have had with the fake youngster.
A member of the Guardians group tells him: "You reading everything? You said you wanted sex.
"So why do it?"
The man answers: "Because I'm lonely. Just someone to talk to somebody is fantastic.
"I'm glad you guys do this, but being in a situation where you are lonely - you've got nobody".
He added: "I wasn't going to. Honest."
The group member says: "I've got every single word that you've said to me on a memory stick in my pocket, ready for the police when they come.
"You should have never spoke to her in the first place."
A police office is later recorded approaching the man's vehicle and the group claim he was taken into custody.
The Driffield Times and Post contacted Northumbria Police and Humberside Police.
Humberside Police declined to confirm whether an arrest was made or whether the man has been charged.