Its report said that looking at a person's activity on the internet is "critical" when treating them, as well as removing the stigma around self-harm.
The UK charity selfharm.co.uk estimates around one in 10 young people struggle with self-harm, but the figure could be much higher because of the nature of the problem and because people do not want to admit it.
Rachael Costa, project developer for selfharm.co.uk, told Premier: "There's a really dark side to it in that some areas of the internet are showing people how to self-harm, and that's why it's really important that the agencies who are trying to help people with self-harm are engaging with the online world."
"I self-harmed for a number of years during my teenage years and it was very much an attempt to make sense of what I was feeling; to make sense of the emotions I couldn't put words to.
"My faith has been a massive part of my journey, both through the really dark times and as a part of my recovery, acknowledging for myself that the love of God isn't something just for other people - it was for me too."
Selfharm.co.uk recommends that victims of self-harm see their GP or youth worker. It also runs a six-week online recovery programme called Illumina.