Fig 5. Self-reported usage rates of the system.
Answers to the question: “How often did you use the system, e.g. clicked a notification, accepted a recommendation etc.?”.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.