Is it legal to use app icons like Angry Birds, Facebook, and Google for my schools yearbook?

You cannot use anyone's trademarks/logos without their permission. Facebook and Google have conditions under which you can use their icons. You can find Facebook's guidelines at http://www.facebook.com/brandpermissions/faq.php and Google's guidelines at http://www.google.com/permissions/guidelines.html. Go check the policy of who owns the Angry Birds for their guidelines. Many large companies are very protective of their trademarks so don't assume that your use in a high school yearbook is necessarily ok.