All ideas originate in a single person’s mind.
Most ideas also die inside that person’s mind.
Except when that person decides to act on that idea and bring it out in the world.
Most people with ideas want to take their ideas to the masses.
Smart people with ideas go with a specific subset first.
They solve a specific problem for one particular audience.
Like Facebook solved the problem of connecting with others inside Harvard.
Once Zuck and the team figured that the idea was working at Harvard, they launched it at other educational institutions.
Then they expanded bit by bit and very fast because momentum was behind them.
You can also go big by starting small.
Think about the smallest version of your idea you can start with without worrying about the future.