The Sun "blacklists" ask.fm and has told their media agency not to buy any more ads from them - it was a "blind purchase" so they did not know they were on the site.
News UK said in a statement: "Our agency booked a broad range of media to promote our fabulous new offering 'Sun plus' and ask.fm was part of the mix.
"On discovering that, we immediately instructed them to pull the adverts and blacklist that outlet".
The father of Hannah Smith, who committed suicide after being bullied on the Ask.fm website welcomes the site's new cybersafety measures.
Major organisations have withdrawn adverts on social networking site ask.fm following the suicide of teenager Hannah Smith.
Maybe it's time we all had a reality check, to look up from our screens, lose the masks we all wear online, and look at each other.