Zynga's Facebook friendship appears to be breaking up.
The games maker and the social-networking giant have updated the terms of their relationship, loosening their ties, according to documents filed Thursday with the U.S. Securities and Exchange Commission.
Zynga shares took a hit in after-hours trading, plummeting 11% to $2.33, following the disclosure.
The agreement change between the two social partners allows Facebook to develop its own games. Under the arrangement, Zynga would no longer have to use Facebook's payments system. The social games maker would also no longer have to use Facebook as the login to its games.
Zynga and Facebook's amended agreement goes into effect in March 2013.
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