Table 2.
Reported recruitment and enrollment from social media.
| Study authors (year) | Participants recruited from social media, n/N (%)a | Participants enrolled from social media, n/N (%)a |
| Abbate et al (2017) [20] | —b | 24/151 (16) |
| Adam et al (2016) [21] | 45/126 (36) | 25/70 (36) |
| Alley et al (2016) [22] | 205/278 (74) | 74/140 (53)c |
| Bracken et al (2019) [23] | 369/19,022 (2) | 16/1007 (2) |
| Buckingham et al (2017) [24] | 598/1945 (31) | 48/96 (50) |
| Burrell et al (2012) [25] | — | 24/105 (23) |
| Cowie et al (2018) [26] | 621/857 (72) | — |
| Frandsen et al (2014) [27] | — | 138/266 (52) |
| Frandsen et al (2016) [9] | 228/414 (55) | 92/175 (53) |
| Guthrie et al (2019) [28] | 461/2627 (18) | 25/302 (8) |
| Heffner et al (2013) [29] | — | 11/222 (5) |
| Huesch et al (2018) [30] | 117/147 (80) | 11/17 (65) |
| Ince et al (2014) [31] | 227/287 (79) | 75/96 (78) |
| Jones et al (2012) [32] | — | 43/589 (7) |
| Jones et al (2017) [33] | 940/1435 (66) | 153/247 (62) |
| Juraschek et al (2018) [34] | 24/121 (6) | 4/121 (3) |
| Kayrouz et al (2016) [10] | — | 70/81 (86) |
| Kendall et al (2018) [35] | 38/162 (23) | 8/24 (33) |
| Kira et al (2016) [36] | 1/74 (1) | 1/24 (4) |
| Kuhn et al (2017) [37] | — | 22/120 (18) |
| Nash et al (2017) [38] | — | — |
| Partridge et al (2015) [39] | 20/1181 (2) | 5/250 (2) |
| Rabin et al (2013) [40] | 11/73 (15)d | 0/12 (0) |
| Raviotta et al (2016) [41] | — | 44/220 (20) |
| Rounds et al (2019) [42] | — | 3/102 (3) |
| Sanchez et al (2018a) [43] | 4/425 (1) | 0/91 (0) |
| Sanchez et al (2018b) [43] | N/Ae | 0/79 (0) |
| Shere et al (2014) [44] | — | — |
| Usadi et al (2015a) [45] | 7/3358 (0.2) | N/A |
| Usadi et al (2015b) [45] | 3/3727 (0.1) | N/A |
| Volkova et al (2017) [46] | 966/2448 (40) | 584/1357 (43) |
| Waltman et al (2019) [47] | 838/3033 (28) | 44/276 (16) |
| Watson et al (2018) [48] | — | 1299/2637 (49) |
aSome studies allowed participants to be counted in multiple recruitment/enrollment methods.
bNot available (not reported by original study).
cIncludes participants enrolled from targeted Facebook ads only.
dIncludes participants recruited from emails and Craigslist.
eN/A: not applicable. Reported as N/A due to inconsistencies in recruitment and enrollment data.