It's similar to Tinder, but with more of a focus on geographical proximity.
It isn't without its detractors, however, with many pointing out just how creepy it is to be giving your information to random people you pass in the street.
The 931 charges – which involve up to 20 British and 50 American alleged victims – were added last week after police found more than 123,000 Skype conversations on his computer.
Officers also seized a large amount of child pornography.
Tinder has a very young skew, with 50 per cent of users aged 18-24, 34 per cent aged 25-35 and only eight per cent aged 35-44.