Ask.fm co-founder Klavs Sinka told ITV News in an exclusive interview that other social networking sites "could learn" from Ask.fm when it comes to its moderation policies.
Mr Sinka said, "I am not afraid to say that Ask.fm is one of the best controlled, best moderated and regulated projects".
"One could learn from us," he added.
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The Islamic centre where the Manchester suicide bomber is thought to have prayed says the attack "has no place in Islam or any religion".
German chancellor Angela Merkel and Indian prime minister Narendra Modi among those to praise "great spirit" of Manchester people.
The bomber's identity has been confirmed by Greater Manchester Police.