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.
App usage of users that do join the social network at time zero (treatment; red) and matched users that do not (control; blue) among users still using the app in each week. Social network users create more posts than control users for a period of about 20 weeks after joining the social network.
