If you've used a dating site or app like Ok Cupid or Tinder, you'll have noticed the hundreds of fake profiles that exist on the sites, seemingly designed to make you hand over your profile to scammers.
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Business Insider obtained a PDF guide that is sold online for just £2.59.
It details how scammers operate fake dating site profiles in order to con men out of money.
The guide isn't available for free, in fact, it was being sold for Bitcoins on a deep web marketplace.
Bitcoin is cryptographic currency favoured by criminals as it allows semi-anonymous online transactions.
The Danish Embassy is currently experiencing a heavily increasing number of online fraud cases, where organised groups or individuals are targeting Danish men looking to meet a Russian woman online.
We therefore highly recommend anyone who is involved in Internet dating to be extremely cautious and not to transfer any money to such foreign accounts as well as to read more information below and follow our links.
It's pretty easy to tell: They send the same message over and over, often with the same link.
But there's a type of dating site scam that's far trickier to spot, and the people who operate it claim to be making thousands of dollars every month fooling vulnerable men.
Part of the scam is usually based on the myth that the Russian woman needs to carry an amount of money through the customs that corresponds to what is needed as financial means of support when applying for a visa.
They use this confusion among other "sweet stories" to trick their victims into transferring them money.
BEWARE OF SENDING MONEY OVERSEAS TO A PEN-FRIEND OR PROSPECTIVE MARRIAGE PARTNER TO VISIT AUSTRALIA TO FURTHER A RELATIONSHIP BEGUN OVER THE INTERNET.