Social network Facebook has "no objection" to installing a "panic button" on its site.

Home Secretary Alan Johnson met with Facebook representatives this week following calls for the social network to offer a "panic button" that enables one-click access to the Child Exploitation and Online Protection (CEOP) Centre.

Concerns about the site's lack of links to the CEOP were raised after convicted sex offender Peter Chapman used the social network to contact and lure 17-year-old Ashleigh Hall to her death.

"I emphasized that including the CEOP abuse reporting button on their site has the potential to transform child protection -- and that the company should put this above all other considerations," the Home Secretary said.

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