All Things Technology

Sooner or later you won't be able to sign in to Yahoo! services with your Google or Facebook accounts. The company is gradually rolling out the option for users to create seperate usernames and passwords to use its services. Right now users can't sign in Yahoo Sport Tourney Pick'EM with their Google and Facebook credentials.
The decision to block users to sign in with their Google and Facebook accounts was given by the company CEO Marissa Mayer, who believes Yahoo rivals could get access to users data and monitors what they do on the site. You wouldn't want to give such valuable information to rivals.