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.
Types of social network sites.
| Tool or app | Number of studiesa |
| 8 | |
| 7 | |
| 6 | |
| 2 | |
| Sina Weibo | 1 |
| Yahoo online discussion group | 1 |
| Web 2.0 (tools not specified) | 1 |
| Any types of social media or network site | 11 |
aMore than 1 social network site was involved in some studies.
