In an elaborate fraud attempt, 4chan users attempted to scam women out of money by setting up "FemCon", a fake event for feminists.
The event, which described itself as an opportunity for people to "shape the future of women's rights", charged $50 for attendees.
However, on Sunday evening, Tumblr users realised the event had been created on 4chan.
Users in the 4chan thread described how to market the fake event and keep the profit sales for themselves.
A 4chan user wrote: "I think we should spread around on Tumblr that there is a feminist convention like dashcon. We rake in the money and the ones who put the most effort into this scam will get a cut of the money. Basically I'm going to set up a fake payment page and we will spread the money after the 'apparent date' of the con."