Which TV network originally aired 'Friends'?

In 'Grey's Anatomy', in which city is the hospital located? In 'ER', in which city is the hospital located? In 'House', what is Dr. Gregory House's medical specialty? Who played Dr. Gregory House in 'House'? Which TV network originally aired 'Seinfeld'? Which TV network originally aired 'The Simpsons'? Which TV network originally aired 'Breaking Bad'? Which TV network originally aired 'The Sopranos'?