A website linked to the suicide of teenager Hannah Smith has said the company does "not condone bullying of any kind" 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.
Ask.fm said in a statement that the company, founded by Mark and Ilja Terebin, wanted to "reassure all users and parents of users that we are committed to ensuring that our site is a safe environment". The statement added: "We do not condone bullying of any kind, or any form of unacceptable use of our site."
Ask.fm described the teenager's death as a "true tragedy" and said they had been speaking to Leicestershire Police since the incident. They went on to say that various measures had been implemented over the past few months to continue improving users' safety, and improved reporting policies have been put in place.
"We have been working with experts at the UK's Safer Internet Centre, and thus the wider EU InSafe organisation, and are in constant discussions with them regarding our privacy and safety policies and the ways in which we may be able to enhance them. This is an ongoing activity, which Ask.fm is wholly committed to," the statement said.
Earlier, the Prime Minister said internet users should boycott "vile" websites which allow cyberbullying 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.
Speaking during a visit to a hospital in Salford, Mr Cameron told Sky News: "The people that operate these websites have got to step up to the plate and show some responsibility in the way that they run these websites. Just because someone does something online, it doesn't mean they're above the law. If you incite someone to do harm, if you incite violence, that is breaking the law, whether that is online or offline.
"Also, there's something all of us can do as parents and as users of the internet and that is not to use some of these vile sites. Boycott them, don't go there, don't join them - we need to do that as well. I'm very keen we look at all the action we can take to try and stop future tragedies like this."