I think you are :
I am the reason you are here
The salvation of the digital world
We are here for sharing our knowledge and gain reputation.
I am quite simple
as I am quite hyper at first
At first, it is hard to gain reputation but after a while it becomes easier
Yet I can sit
And create speeches and essays for everyone
Reputation details give all the information about us, badges and achievements are the reference for speeches and essays.
I can fly like the wind
No restrictions from gravity
And a good mark in my criminal record
Reputation has no limits, you can go higher and earn everyday. And while gaining it, your record becomes better as well.
You speak of me
By mouth or text, who knows what's next?
This I can't directly relate but, may be unlocking more privilages by gaining reputation