Table 2.
Four social networks.
| Social network | Social network launch date | Data acquisition date | Number of days active | Number of subjects registered in program | Number of actors, n (%) | Number of actor postsa | Number of subjects in analysis, n (%)a |
| Problem drinking |
Dec 26, 2005 | Dec 31, 2015 | 3658 | 5049 | 1085 (21.49) | 16,231 | 4784 (94.75) |
| Depressive disorder |
Feb 6, 2003 | Dec 31, 2015 | 4712 | 11,675 | 2065 (17.69) | 20,516 | 1958 (16.77) |
| Panic disorder | January 23, 2002 | Dec 31, 2015 | 591 | 9783 | 3579 (36.58) | 61,743 | 6151 (62.87) |
| Smoking cessation |
Sep 26, 2001 | Dec 31, 2015 | 5210 | 52,396 | 8452 (16.13) | 521,997 | 12,061 (23.01) |
| Total | n/ab | n/a | 18,671 | 78,903 | 15,181 (19.24) | 620,487 | 25,178 (31.91) |
| Mean | n/a | n/a | 4688 | 19,726 | 3795 (19.24) | 155,122 | 6239 (31.63) |
aModerator posts removed.
bn/a: not applicable.