"The change in outlook is primarily due to reduced expectations for certain web games including The Ville, and delays in launching several new games," Zynga said in its statement. The news was also weighing on Facebook ( FB), which failed to make much hay with its announcement that it surpassed one billion monthly users . The stock added just 12 cents in the regular session to close at $21.95, but the lower outlook from partner Zynga, which has a revenue-sharing deal with Facebook, sent shares down 1.6% to $21.60 on volume of nearly 800,000. -- Written by Michael Baron in New York. >To contact the writer of this article, click here: Michael Baron.