With Yahoo!'s "stickiness" slumping, the company is hoping that social media will help boost user engagement. The site has inked a deal to distribute social games produced by Zynga, the developer of the popular Farmville game, and will also allow users to access their Facebook feeds from within Yahoo! mail. "When they engage with this, the amount of time spent on the network goes way up," says Yahoo! e-mail chief Jason Titus.