Just go change your password.
They really have no idea how many accounts were compromised.
http://www.forbes.com/sites/jameslyne/2014/01/31/yahoo-hacked-and-how-to-protect-your-passwords/
http://www.theregister.co.uk/2014/01/31/yahoo_mail_users_change_your_password_now/
They really have no idea how many accounts were compromised.
http://www.forbes.com/sites/jameslyne/2014/01/31/yahoo-hacked-and-how-to-protect-your-passwords/
http://www.theregister.co.uk/2014/01/31/yahoo_mail_users_change_your_password_now/