“We can count on so few people to go that hard way with us,” the poet Adrienne Rich observed as she contemplated the art of honorable human relationships on the cusp of the Internet revolution that furnished the commodification of the word friend. “Ponder for a long time whether you shall admit a given person to your friendship,” Seneca counseled two millennia earlier in his meditation on true and false friendship, “but when you have decided to admit him, welcome…