Hi there,
Let me introduce myself. When I first heard about the flat earth society, I thought it must be a joke, untill I actually came here.
Of all the conspiracy theories I heard about, I find this one the most intriguing, because for me, there is nothing in my mind which questions the shape of the earth.
Looking outside and we see a flat earth, but the sheer size of the earth causes it to look flat. If we'd only take the airplane, when we are at high altitudes, we can see so much further than if you're standing on the ground. That is quite proofing for me.
Furthermore there are all the scientists, whose work is always checked and can be checked by almost anyone.
I don't see how the shape of the earth would still go undetected. What would be the reason to lie about something as simple as the shape of the earth anyway?