What evidence would distinguish these two possibilities?
Select arbitrary productivity metric. Select people in a controlled environment (like cubicles). Randomly assign their IP addresses to a correctly configured DNS server or a DNS server with a faulty entry for ‘facebook.com’. See if there is a difference.
Select arbitrary productivity metric. Select people in a controlled environment (like cubicles). Randomly assign their IP addresses to a correctly configured DNS server or a DNS server with a faulty entry for ‘facebook.com’. See if there is a difference.