Table 1.

Recent indicative infodemiology studies.

Author(s)	Keywords	Google Trends	Twitter	Facebook	Other social media (eg, YouTube)	Blogs, forums, news outlets, Wikipedia	Databases, electronic health records	Other search engines (Baidu)
Abdellaoui et al [30]	Drug treatment					✓
Allen et al [31]	Tobacco waterpipe		✓
Berlinger et al [32]	Herpes, Vaccination	✓
Bragazzi and Mahroum [33]	Plague, Madagascar	✓
Chen et al [18]	Zika epidemic		✓
Forounghi et al [34]	Cancer	✓
Gianfredi et al [35]	Pertussis	✓
Hswen et al [36]	Psychological analysis, Autism		✓
Jones et al [37]	Cancer					✓
Kandula et al [38]	Influenza	✓
Keller et al [39]	Bowel disease, Pregnancy, Medication			✓	✓	✓
Mavragani et al [7]	Asthma	✓
Mejova et al [40]	Health monitoring			✓
Odlum et al [41]	HIV/AIDS		✓
Phillips et al [42]	Cancer	✓
Poirier et al [43]	Influenza, Hospitals	✓					✓
Radin et al [44]	Systematic Lupus Erythematous	✓
Roccetti et al [20]	Crohn’s disease		✓	✓
Tana et al [25]	Depression, Finland	✓
Vsconcellos-Silva et al [45]	Cancer	✓
Wakamiya et al [46]	Influenza		✓
Wang et al [47]	Obesity	✓
Watad et al [48]	West Nile Virus	✓			✓	✓
Xu et al [49]	Cancer, China							✓