Online dating love plenty of fish
Among the most popular apps, Plenty of Fish accounted for 56% of all crimes reported.
The crimes include attempted murder, sexual activity with children, grooming, rape, sexual assault, sending indecent images and blackmail.
"After a period, he told me that his mum had been diagnosed with cancer - he even cried when he told me - and that he would be spending every weekend in Yorkshire with her.
"Of course what I now know was that was just his excuse to spend time with his wife and kids." Eventually it emerged that "Antony Ray" had created a fake profile on Tinder and was in fact a serial womaniser, despite having a wife and children.
"But we can say that it is against our policy to request sensitive information, including passwords, from users in such instances, and that we banned the account in question after being notified." Anna Rowe, a 44-year-old teaching assistant from Canterbury, thought she'd met the man of her dreams on Tinder.
She fell in love with Antony Ray, striking up a 14-month relationship before his lies and deceit began to unravel.
They have also told how they felt let down by the police, and those behind the apps, who did not seem interested in taking action.
The mum-of-one eventually discovered that a profile had been set up on the dating site using all her pictures, contact information and even address.
She told The Sun Online: "It was such a shock, and so disturbing. "It began as some very explicit messages, or they'd just text me to confirm plans or meet ups which I had no idea about.
Miss Davis added: "I went to the app to complain, but Plenty of Fish were useless.
There is no phone number to call them on other than one in the United States and that went right to a voicemail.