Yahoo, like Google and Facebook, have denied involvement in PRISM.
"Yahoo! has not joined any program in which we volunteer to share user data with the U.S. government," Yahoo General Counsel Ron Bell wrote in a Tumblr post Saturday. "We do not voluntarily disclose user information. The only disclosures that occur are in response to specific demands." Moving past outright denial of participation, companies such as Twitter, Microsoft, Facebook and Google are now pressing the government for permission to publish more information about the number of secret requests it receives for customers' data.
Read more: http://www.disclose.tv/news/Yahoo_Was_Forced_To_Join_PRISM_By_A_Secret_Court/89847#ixzz2WPWJKcLq