From Superman's debut, the protagonist leading a double life was a key trope of the superhero genre. There were exceptions, like the Sub-Mariner and (for a while) Doctor Fate, but even dead guys like the Spectre had secret identities.
These days, especially at Marvel, not so much. Admittedly, even from its early days, Marvel seemed less hung up on the secret identity than DC. But now, even the X-Men - who were in hiding so people wouldn't assassinate them for being mutants - are publicly known. Spider-Man's now the rare exception to the celebrity superhero, and they even tried it with him during Civil War. Over at DC, you could even argue that Batman's anonymity was undermined by Batman, Inc, and he was the absolute poster-boy for the secret identity.
So, what happened? Does this say more about the way the genre's changed, or the way that we've changed?