"internet use disorder" is not in the dsm-5, but if it is included in the next edition, a research-based estimate of the percentage of people in the united states who would fit the diagnostic criteria would be about:

I believe the answer is: 1%.
Internet use disorder refers to a form of psychological disorder that characterized by addictive behavior for using internet.
Even though the name sound less serious, it could most likely damage the victim's ability to form a real human connection with other people that would negatively affect their future.

During the paleolithic, hominins grouped together in small societies such as bands, and subsisted by gathering  plants  and fishing, hunting or scavenging wild  animals. the paleolithic is characterized by the use of knapped stone tools, although at the time humans also used  wood  and bone tools.