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Ads pulled from ask.fm after death
Prime Minister David Cameron said website operators must 'step up to the plate' to ensure people are protected from online abuse
The website linked to the suicide of teenager Hannah Smith is facing a backlash after several major companies decided to withdraw advertising from the site.
Specsavers, Vodafone, Laura Ashley and charity Save the Children have all pulled ads from ask.fm.
Hannah, 14, was found hanged on Friday after being bullied on the website.
A Specsavers spokesman said the company had instructed ask.fm to remove all of its adverts from the site due to "deep concerns over cyber-bullying". Save the Children added: "We put the welfare of children first and as a result of the tragic case of Hannah Smith we no longer advertise on ask.fm."
Earlier, the Prime Minister said internet users should boycott "vile" websites which allow cyber-bullying to avoid more deaths of young people who receive abuse online. David Cameron said website operators must "step up to the plate" to ensure users are protected.
Hannah's father, David Smith, said those who run the website should face murder or manslaughter charges and called for more regulation of social networking sites. Ask.fm described Hannah's death as a "true tragedy" and promised to work with police investigating the incident.
The question-and-answer site allows users to send messages to one another without their identity being disclosed. Although users have to register an email address, name and date of birth, those posting messages can do so anonymously.
A spokeswoman for the website said: "Hannah Smith's death is a true tragedy. We would like to convey our deepest condolences to her family and friends. We have reached out to the Leicestershire police and would be happy to co-operate with their investigation into the true circumstances of her suicide.
"Ask.fm actively encourages our users and their parents to report any incidences of bullying, either by using the in-site reporting button, or via our contact page. All reports are read by our team of moderators to ensure that genuine concerns are heard and acted upon immediately - and we always remove content reported to us that violates our terms of service."
Facebook confirmed that it had received reports of inappropriate comments posted to a tribute page to Hannah Smith and any which violated the website's terms have been removed.