Stay one step ahead of the fraudsters with our series of articles giving you the lowdown on the scams they use to trick people out of their hard-earned cash - and how to avoid being taken in by them.
This week, we explain how to avoid falling for the latest online marketplace scams.
How does it work?
More than a quarter of Britons have been the victim of an online marketplace scam, losing £63.76 on average in each incident, according to a new report from local trading website Gumtree.
Popular categories targeted by online fraudsters include vehicles, jobs, and property, as well as miscellaneous items for sale.
In many cases, the items or positions advertised are slightly cheaper or more attractive than others available, but not so different that they arouse suspicion.
Morten Heuing, general manager at Gumtree, told The Telegraph: "Whilst millions of people use these websites safely and successfully, the reality is that fraudsters are out there exploiting honest users."
How can I avoid being caught out?
Marketplace scams can be difficult to spot. When participants in a recent survey were shown eight adverts and asked to identify the fraudulent listings, only 7% of respondents spotted all the scams.
However, there are some signs that indicate an advert may not be all that it seems. These include spelling mistakes, a lack of detail and factual errors in the description.
Victims of scam listings also report being put under pressure to complete the transaction quickly, with many encouraged to pay for an item without seeing it first.
I've been defrauded. What should I do?
The Gumtree research shows that one in six people who fall for marketplace scams are too embarrassed to tell anyone about them.
But reporting fraudsters is an essential part of the fight against scams of this kind.
So be sure to report online scams to the marketplace concerned, as well as the police via Action Fraud on 0300 123 2040.
Victims of scams and fraud
Victims of scams and fraud
Susan Tollefsen, Britain's oldest first time mother, was scammed out of £160,000 by a fraudster she met on an online dating site. A man claiming to be an Italian gold and diamond dealer told her he was in the middle of a land deal but couldn't access cash. Tollefsen felt sorry for him and started wiring him money, eventually selling her jewellery, her flat and borrowing £32,000 from friends to give him. Read the full story here.
In March 2015 an American woman who was only identified as 'Sarah' went on the popular US television programme the Dr Phil Show to reveal she had sent $1.4 million to a man that she had never met. Although she was certain she wasn't being scammed, her cousin made her go on the programme because she was convinced it was a scam. Find out more about the story here.
Maggie Surridge employed Lee Slocombe to lay a £350 deck in her garden in March 2015. However Slocombe used a combination of lies to scam Surridge out of thousands of pounds. He told Surridge that the front and back walls were dangerous and needed rebuilding and also conned her into building a porch, all for the cost of £8,500. Read the full story here.
It's not just individuals who can be the victims of scams, big corporations can also fall foul of these fraudulent practices. In 2015 Claire Dunleavy repeatedly used a 7p 'reduced' sticker to get significant amounts of money off her shopping at an Asda store in Burslem, ending up with her paying just £15.66 for a shop that should have cost £69.02. Read the full story here.
Sylvia Kneller, 76, was conned out of £200,000 over the space of 56 years thanks to scam mail. The pensioner became addicted to responding to the fraudsters, convinced that she would one day win a fortune. Ms Kneller would receive letters claiming she had won large sums of money but she needed to send processing fees to claim her prize. Learn about the full story here.
Leslie Jubb, 103, became Britain's oldest scam victim in August last year when he was conned out of £60,000 after being sent an endless stream of catalogues promising prizes in return for purchasing overpriced goods. The extent of this con was discovered when Mr Jubb temporarily moved into a care home and his family discovered what he had lost. Find out more about this story here.
Stephen Cox won more than £100,000 on the National Lottery in 2003 but has been left with nothing after falling victim to two conmen. The 63-year-old was pressured into handing over £60,000 to the men who told him his roof needed fixing. They walked him into banks and building societies persuading him to part with £80,000 of cash while doing no work in return. See the full story here.
Last year the Metropolitan Police released CCTV footage of a woman who had £250 stolen at a cash machine in Dagenham. The scam involved two men distracting the woman at the machine, pressing the button for £250 then taking the money and running away. Read about the full story here.
Rebecca Ferguson shot to fame as a runner up on the X-Factor in 2010 but fell victim to a scam artist last year when someone she had believed to be a friend conned her out of £43,000. Rachel Taylor befriended the singer in 2012 and claimed to be a qualified accountant, so Ferguson allowed her to look after her finances. Instead of doing this Taylor stole £43,000 from the Liverpudlian singer. Read more here.
When Rebecca Lewis discovered her fiance had started a relationship with a woman he met online she packed her bags to leave. But that didn't stop her checking out the mystery woman, Rebecca quickly realised Paul Rusher's new love was actually part of a romance scam. She told Paul just before he sent the scammers £2,000 which was supposed to bring his new girlfriend to England. Find the full story here.