(CNN) The inventor of the world wide web has called for global efforts to tackle state-sponsored hacking, criminal behavior and abusive language on the internet, in an open letter marking the 30th anniversary of the revolutionary technology.

Tim Berners-Lee acknowledged that "many people feel afraid and unsure if the web is really a force for good," in a letter published for his World Wide Web Foundation on Monday.

"While the web has created opportunity, given marginalized groups a voice, and made our daily lives easier, it has also created opportunity for scammers, given a voice to those who spread hatred, and made all kinds of crime easier to commit," the letter added.

Berners-Lee, who has previously rallied for improvements to the technology, said the "fight for the web is one of the most important causes of our time." He added: "You can't just blame one government, one social network or the human spirit....To get this right, we will need to come together as a global web community."

The computer scientist submitted his first proposal for an "information management system" on 12 March 1989 -- plans that his boss called "vague but exciting."

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