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It's not just guns and drugs that are up for sale on deep web sites.

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

Another way to spot whether an account is fake is the selection of photos that it uses.

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.

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

Step two in the dating scam guide deals with "developing a virtual relationship." Scammers are told to ask lots of questions about their targets, paying particular attention to their past relationships.

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.

Business Insider obtained a PDF guide that is sold online for just £2.59.