Hollywood stars like Cameron Diaz and Mike Myers are being banned from using the social networking website 'Twitter', as studios fear that they will unwittingly reveal secret details of their film projects.

Studio bosses think that Twitter addicted stars are damaging the industry by leaking information on the site, which has more than 2 billion followers around the globe, reported Sun online.

To deter the actors, studios are now inserting clauses in their contracts forbidding the use of such networking sites.

Stars affected include Cameron Diaz and Mike Myers, who are due to make the next film in the superhit Shrek franchise, next year for Dreamworks Studio.

The move comes after American Idol judge Paula Abdul dramatically resigned this year on Twitter, while Transformers star Megan Fox was branded "dumb as a rock" in a cyberspace row.