But there is nothing to stop perverts using false ages to join.
Some users openly say they are men looking to meet under-age girls.
Shockingly, many users are adults trying to contact naive youngsters, a Sunday People investigation found.
The site allows anyone aged 13 to 25 to register, give out contact details and post provocative pictures of themselves.
Girls as young as 13 are flocking to use a teen dating website which allows them to be targeted with vile sexual messages from older men.
My LOL.com, described by worried NSPCC officials as a “playground for paedophiles”, is one of a number of sites rapidly overtaking social networking favourites like Facebook. But it is the most popular dating site for under-18s in the UK and is visited by more than 300,000 users a month.
Within minutes she was bombarded with private messages from six males. One user called Jamie69 claimed on his profile that he was a 14-year-old boy from South Hayling, Hants.Disturbingly, he clearly had more in mind than a friendly chat.