Well, first of all, Adhrann suggests that readers look for certain types of men: "40-60, technical or financial formation (IT, analyst, accountant, consultant, engineer, etc); lonely, or still living with parents, poor social/conversational skills, shy, a bit weird, nerd type, etc." So if that sounds like you, stay alert.

Millions of Americans use dating sites, social networking sites, and chat rooms to meet people. But scammers also use these sites to meet potential victims.

They create fake profiles to build online relationships, and eventually convince people to send money in the name of love.

Vendors also list guides on how to commit other illegal activities.

The documents are often sold for small amounts of money, but the price barrier, the need to pay with Bitcoin, and the fact that they're only available on the deep web prevents the guides from being circulated widely.

In the end, the money will be gone along with the person you thought you knew.

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.

Adhrann's guide says that scammers should "look on the Internet for a bunch of pics of a cute girl" and select someone who is "not a top model, but a normal sexy girl." To find photos, scammers can buy sets of photographs of young women, often through shady forums frequented by hackers.

This screenshot shows a user of a hacker forum being advised that a quick way to find sets of photos is to automatically download them from Facebook: Even before a scammer messages you, you can spot they're fake by checking their photos.

Performing a Google image search for an account's profile picture will show you where on the internet the image appears — sometimes you'll see it attached to Facebook, Instagram and Twitter accounts with various different names.

That's a sure sign that the account is fake, as the photo must have been circulating on the internet.

Dating sites are, thankfully, getting better at spotting who is using their service to send thousands of spam messages.