Originally Posted by
Ascended
The secret identity holds up fine until you bring in the idea of facial recognition tech.
Because we know the secret, its easy to think that other people in-universe would jump on it. Oh, that Kent guy is a white dude with dark hair, and he works for the Planet and has written about Superman! Obviously they're the same guy even though there's probably dozens of dark haired white guys at the Planet, not to mention the millions in Metropolis alone! No, that's not what people are going to think. Nerdy, introverted, "forget he's in the room with you" Clark Kent is far too shy and quiet and awkward to have a double life, much less secretly be the greatest hero who ever lived.
And no one is thinking that Superman has a secret identity in the first place. No one puts it together because no one is looking.
Perry would figure it out, because he's Perry. Lois *did* figure it out, very early on, but could never prove it. Jimmy is....well he's Jimmy, stuff goes over his head all the time. Nobody else really interacts with both Clark and Superman enough to put it together. Lex, depending on the history and version, might if not for his ego. His own self-image prevents him from accepting that a god among men would live a life like Clark Kent's. Lex knows, deep down, but he can't rationalize it.
Facial recog could be a problem, but the answer to that is a very simple "Kryptonian computer virus skews the data."
I spent more than ten years working in a place where celebrities and world leaders would visit. And without the makeup, lighting, and pomp and circumstance you expect to surround them, they're pretty hard to notice. For Clark, who goes a lot further to protect his identity than a baseball cap and sunglasses and changes every aspect of his mannerisms, voice, speech patterns, etc., I can totally believe he could fool the world.
Some folk say "all it would take is one person figuring it out." No. One person figuring it out is a lunatic on the internet throwing around stupid conspiracy theories. We debunk stuff that is far more proven, with far more people supporting it (climate change); one person saying Superman is Clark is just gonna get laughed out of the room.