Table 4.

Age distribution for Google+Health, drug reviews, health forums, and other relevant populations.

Source	0-17 years, %	18-34 years, %	35-44 years, %	45-64 years, %	65+ years, %
Population [30]	24.00	23.11	12.93	26.53	13.44
Internet use [31]	19.30	27.55	14.99	28.36	9.80
General social networks [34]	14.58	27.43	20.68	30.98	6.32
Google+ [38]	8.08	71.61	11.08	7.82	1.42
Google+Healtha	3.42	53.21	21.89	19.02	2.46
Drug review websitesa	1.05	31.13	22.36	36.84	8.62
Health Web forumsa	1.03	39.80	25.81	28.95	4.41

^aThese results are from this work. Results in the rows above are reported in the respective citations.