Android Game

Last year the company made about $91m in profit on revenues of $600m selling virtual products to players and advertising to brands, according to its Securities and Exchange Commission filing made on Friday. In the first quarter this year Zynga made profits of $11.8m on revenues of $235m.

Zynga said it has 60 million daily active users, who collectively spend 2bn minutes each day playing its games.

"If Facebook loses its market position or otherwise falls out of favour with internet users, we would need to identify alternative channels for marketing, promoting and distributing our games, which would consume substantial resources and may not be effective," the company said.