The fact that the Youngers are black now seems less like an innovation than a detail, though it's marvelous to see how precisely Ms. Hansberry caught the tone of black life in the 1950s.
You cannot force anyone to buy your new and marvelous technologies, no matter how well they save the environment or reduce that dreaded carbon footprint.
Facebook founder Mark Zuckerberg and his legions of brilliant engineers and designers have figured out how to make the site into a marvelous place to hang out.