Dale Carnegie’s “How to Win Friends and Influence People,” which turns 75 this year, has sold more than 30 million copies and continues to be a best seller. The book, a paean to integrity, good humor and warmth in the name of amicable capitalism, is as wholesome as a Norman Rockwell painting. It exists alongside Dr. Spock’s child-rearing guide, Strunk and White’s volume on literary style and Fannie Farmer’s cookbook as a classic expression of the American impulse toward self-improvement and reinvention. Testimonials to its effectiveness abound. It’s said that the only diploma that hangs in Warren Buffett’s office is his certificate from Dale Carnegie Training.

The book’s essential admonitions — be a good listener, admit faults quickly and emphatically, and smile more often, among them — are timeless. They need updating about as much as Hank Williams’s songs do.

Yet now comes Dale Carnegie and Associates Inc., which offers leadership and public speaking classes, with the news that it has rewritten and reissued Carnegie’s book for the laptop generation under the title “How to Win Friends and Influence People in the Digital Age,” written with Brent Cole. It’s not the only advice classic that’s been updated this fall for the era of Facebook and Google Plus. There’s a new edition of “Emily Post’s Etiquette” as well, which bears the forward-looking subtitle “Manners for a New World.”