Superman explains to young Timmy that the reason he has changed from using phone booths to using photo booths is because it's now about image, not communication, connection, change ... well, whatever it was about in the days of phone booths.
"It's more important to be photogenic than to change," he tells Timmy. "If you could wish for one super power, photogenic should be it," he continued. "If you don't look good on the movie posters, no one will ever come to the cinema to find out what else you can do."
And then, he tucked the photo booth under his arm, said, "I'm going to need this for selfies!" saluted Timmy, and flew off.