The two-day #WeProtect Children Online summit has begun in London to tackle child sexual exploitation online.
Representatives from more than 50 countries, as well as experts from leading technology companies, are involved.
One worry is not only for the abuse of the children being exploited online, but also for the protection of children finding inappropriate images.
The NSPCC has said that one in five explicit photographs circulating on the internet have been taken by children themselves.
It added with smartphones and tablets becoming desirable gifts for children and teenagers, there is a greater risk of coming across this material, and potentially replicating it.
The aim is to create a coordinated global response to tackle child abuse.
The Home Secretary Theresa May opened the conference earlier.