Table 5.
Percentages of categories in each source from the labeled data (N=500).
| Category | WebMD, n (%) | DailyStrength, n (%) | TwitterHealth, n (%) | Google+Health, n (%) |
| Share experiences | 236 (47.2) | 400 (80.0) | 74 (14.8) | 65 (13.0) |
| Ask for specific medical advice or information | 270 (54.0) | 173 (34.6) | 3 (0.6) | 10 (2.0) |
| Request or give psychological support | 126 (25.2) | 247 (49.4) | 9 (1.8) | 7 (1.4) |
| About family (not about self) | 68 (13.6) | 37 (7.4) | 5 (1.0) | 34 (6.8) |
| Share news | N/Aa | N/A | 56 (11.2) | 145 (28.9) |
| Jokes | N/A | N/A | 38 (7.6) | 33 (6.6) |
| Advertisement | N/A | N/A | 26 (5.2) | 70 (14.0) |
| Personal opinion | N/A | N/A | 35 (7.0) | 84 (16.8) |
| Educational material | N/A | N/A | 36 (7.2) | 137 (25.7) |
aN/A: not applicable.