Anyone who does something of value, any value, for someone or something other than themselves, that will be forgotten by most within nanoseconds but still, grand recognition of the event persists anyway because of the narcissistic nature of contemporary society. The requirements for earning this moniker were much more extensive in the 20th Century and earlier. Back then, you had to, like, save somebody from a fire to earn the title.
He opened the door for the old lady behind him, and he didn't even slam it in her face this time. What a hero! This great deed will be heralded for all... oh, got a text... what was I saying? Can't remember. Probably wasn't important anyway.
11pm news broadcast: Guy holds door for old lady, who escapes her normal facial bruising. This guy has just been picked to be the grand marshal of the next town parade, followed by him receiving the key to the city.