Major organisations have withdrawn adverts on social networking site ask.fm following the suicide of teenager Hannah Smith.
Despite the company saying that it does "not condone bullying of any kind", several major firms have pulled ads, including:
Hannah, 14, was found dead on Friday after being bullied on the social networking site.
A statement from ask.fm said they wanted to "reassure all users and parents of users that we are committed to ensuring that our site is a safe environment".
They 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.
The vast majority of our users are very happy teenagers, who use Ask.fm to converse with their peers around the world about the things that interest them. Bullying is an age-old problem that we in no way condone – and while its evolution online is disturbing, it certainly is not unique to our site. We will continue to work with the appropriate organisations to safeguard against bullying on Ask.fm – and we would welcome the opportunity to align with the rest of industry and society in fighting it on a higher level. We are proud of the phenomenal popularity of the social network we have created and strive every day to make it better and safer.
Earlier, David Cameron called for internet users to boycott "vile" cyber bullying websites and said he was looking at what action to take "to try and stop future tragedies likes this".
I think he’s passing the buck like normal. He’s passing the buck onto the companies that do the websites and the websites aren’t going to do it. So nothing’s ever going to change unless we get some regulations in to change the way websites are used. The internet needs regulating. It’s a waste of time going to the website people and saying they have to do it because they are not going to do it, because they are making too much money. It’s up to the Government to now start regulating the internet and make the internet safe for children.
Leicestershire Police confirmed they had been contacted by Hannah's father about further claims of "inappropriate postings" on Facebook.