For the record, Uncle Mxy, there is nothing frivolous or pointless about umlauts, as many eighties hair bands will tell you.
I'd want to learn enough to identify and get all these "world leaders" in a room and working out their differences.
Or, better yet, in the words of Gary Larson, "put them in a jar with holes at the top, shake it, and see if they'll fight!"
For that matter, I wouldn't want the world to know that a SuperMAN as such really even exists. Let the world think robots from outer space are intervening to try and keep humanity from blowing itself up, or somesuch. The sight of a billion people chanting "Klaatu barada necktie" would be awe-inspiring, I'm sure.
Hey, it worked for Astro Boy.
Although - show of hands: who would use their powers in secret vs. using their powers openly if they were in fact, Superman? Because both approaches have their pros and cons:
Keeping Powers Secret: You get to trick and play gags on people at a level never before seen. And nobody could possibly complain, because who could ever believe the cause of things is superpowers?
"No, I couldn't possibly have melted that 20 foot ice sculpture you had made of yourself, Ted Turner - what, you think I have 'laser-vision' or something?" Great choice if you're the type that loves laughing on the inside.
Using Powers Openly: Enjoy the movie-star level adulation from a grateful world, and it allows participation in high visibility crisis events. And it isn't like you're getting hollow praise from bootlicking sycophants for doing something mediocre, like win a game show - you're Superman, saving the earth from Lava Men!