What are those monitors in the background doing?

I always see 3 monitors in the back on the tek and inbox.exe.  I always wondered like is that attached as mirrored monitors for different computer in the building?

Logan has said it is bitcoin mining.

They're just there for show :P

My understanding is the one Logan looks at is mirroring the one on the very right. The rest are probably doing something else.

They're connected to the PC that's trying to crack the NSA's security

yes, you are correct.

Logan actually adjusted the flicker rate for the monitors to control our minds. Once we the viewers of his show have been brainwashed, he will become the new leader of the internet. 

and his followers will be called "Loganites"