Sexy chat cam bot dating service called plenty of fish
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.
Bitcoin is cryptographic currency favoured by criminals as it allows semi-anonymous online transactions.
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.
To be clear, automated bots running fake accounts are following you, and the profile photos are of cam girls. If they run 1000 accounts following 1000 users, perhaps 50 people follow back each account.
They've suddenly got 50,000 followers, albeit spread out over 1000 accounts.
The accounts reuse other people's tweets, and other phrases found on the Internet, to give the semblance of original thought, in the hope that people retweet or like them.
If they do, that positive interaction suggests to Twitter that they might be valid users.
If the 50th tweet is a spam link, and someone actually goes to the lengths to report that link, they may not be blocked instantly, because they've built up street cried as "legit" accounts.
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.