"I left my heart out there, and this guy took advantage of it," the 51-year old Best said.

In 2011, the FBI's Internet Crime Complaint Center received 5,600 complaints from victims of so-called "romance scammers" -- criminals who scan online dating sites, chat rooms and social networking sites for potential victims.

Around 7.8 million UK adults used online dating sites in 2016, up from just 100,000 in 2000.

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The picture — outdoor photo, big smile — was real, and recent.

And her pitch was straightforward: Looking for a life partner …

Ayelotan and Raheem were also found guilty of conspiracies to commit bank fraud and money laundering.

Dating back to at least 2001, the scammers were involved in multiple internet fraud schemes, resulting in losses in the tens of millions, according to the Department of Justice.

Nancy*, a 47-year-old single mother from North Yorkshire was conned out of over £350,000 that way: “I wasn't comfortable, and then I got so far in I couldn't get myself out, and I didn't want to walk away having lost £50,000 or what-have-you, so you keep going in the hope that you're wrong and this person is genuine,” she explained to the BBC.

Nancy is now facing bankruptcy, and although her case is extreme, the average victim of online dating fraud loses £10,000 according to Action Fraud.The victims reported collective losses of .4 million, which is likely only a fraction of the actual losses since many victims are too embarrassed to file a report, the FBI said.About 70% of the victims were female; more than half were women 40 years or older.In a typical con, the perpetrator will spend weeks or even months building up a romantic relationship with a victim through e-mails, texts or phone calls, before eventually asking for money.And many of the scammers aren't even in the United States."In the process of going back and forth, a scammer is going to try to figure out what makes a person tick, what their vulnerable spots are," said Jenny Shearer, an FBI spokeswoman.