Players are spending 20 percent less on Zynga games, which means Facebook is receiving less money from those games as well. Overall, gaming on Facebook isn’t doing as well as I’d like,” Facebook CEO Mark Zuckerberg said during the company’s third-quarter earnings conference call today. He said the rest of Facebook’s gaming network has been growing — monthly payments revenue from other games has increased by 40 percent since last year — but Zynga’s numbers have fallen. Read the full story at CNET.