Table 6.

Correlation across all states between the normalized (per capita) number of users for each type of health-related social outlets, and each state’s population, normalized number of Internet users, normalized number of physicians, normalized number of uninsured patients, average annual income, and percentage of population with college degree or higher.

Correlation	Health Web forums	Drug review websites	TwitterHealth	Google+Health	Google+
Internet usage [31]	0.19	0.28	0.01	-0.01	0.00
No. of physician [42]	0.37	0.19	0.88	0.80	0.44
Uninsured population [43]	-0.40	-0.40	-0.17	-0.11	-0.10
Annual income [44]	0.38	0.27	0.17	0.25	0.26
Education (ratio of people with a college degree) [45]	0.35	0.22	0.56	0.63	0.54