How eggs became a victory for the animal welfare movement

...In recent years, there has been a veritable revolution in public attention to eggs and the chickens that produce them. In the past two years, nearly 200 U.S. companies – including every major grocery and fast-food chain – that together buy half of the 7 billion eggs laid monthly have pledged to use only cage-free eggs by 2025.
Grudgingly, the industry group that represents 95 percent of domestic egg producers says a cage-free future is a fait accompli.
The fast shift toward uncaged hens is a sign of Americans’ increasing concern about animals, even ones known more for clucking than cuteness. But it also amounts to one of the animal advocacy movement’s biggest victories in decades – one brought about by ballot measures, campaigns against companies, foodie culture and, above all, the power of the Internet.