One of the world's biggest toy companies has warned popular social networking website Facebook that a highly popular Scrabulous game on its site infringes on copyrights.

Hasbro, Inc, which owns the U.S. and Canada rights to the Scrabble game has sent letters to Facebook in the U.S. regarding the software program, but no action has yet been taken.

Applications which run on Facebook can be created by third parties, who profit from ads next to the software. The Scrabulous game was made by Rajat Agarwalla and Jayant Agarwalla, who live in India.

Mattel owns the rights to the game in the rest of the world. It is reviewing its position regarding other countries, according to Reuters.

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