Table 3.
Categorized top 50 shared website domains. Total number of occurrences of external references (n=7,753,841).
| Link category and rank | Domain | Occurrences, n (%) | |||
| Mainstream or local news | |||||
|
|
8 | theguardian.com | 52,733 (0.68) | ||
|
|
11 | nytimes.com | 42,735 (0.55) | ||
|
|
13 | cnn.com | 35,494 (0.46) | ||
|
|
14 | bbc.co.uk | 28,286 (0.36) | ||
|
|
15 | washingtonpost.com | 27,316 (0.35) | ||
|
|
19 | bbc.com | 25,853 (0.33) | ||
|
|
28 | nyti.ms | 17,720 (0.23) | ||
|
|
30 | reuters.com | 17,589 (0.23) | ||
|
|
33 | cnbc.com | 17,321 (0.22) | ||
|
|
35 | bloomberg.com | 16,330 (0.21) | ||
|
|
37 | elpais.com | 15,888 (0.20) | ||
|
|
38 | ouest-france.fr | 14,976 (0.19) | ||
|
|
40 | francetvinfo.fr | 14,609 (0.19) | ||
|
|
41 | scmp.com | 14,072 (0.18) | ||
|
|
43 | reut.rs | 13,637 (0.18) | ||
|
|
46 | forbes.com | 13,242 (0.17) | ||
|
|
48 | nypost.com | 12,464 (0.16) | ||
|
|
49 | businessinsider.com | 12,433 (0.16) | ||
| News blog, feed, or niche news | |||||
|
|
17 | medium.com | 26,201 (0.34) | ||
|
|
42 | zazoom.it | 13,926 (0.18) | ||
|
|
45 | zazoom.info | 13,303 (0.17) | ||
|
|
47 | topicza.com | 12,960 (0.17) | ||
| Government or public health | |||||
|
|
25 | cdc.gov | 19,729 (0.25) | ||
|
|
27 | who.int | 18,298 (0.24) | ||
| Personal blog | |||||
|
|
23 | wordpress.com | 22,376 (0.29) | ||
| Social network | |||||
|
|
1 | twitter.com | 378,508 (4.88) | ||
|
|
2 | youtu.be | 365,716 (4.72) | ||
|
|
3 | instagram.com | 290,336 (3.74) | ||
|
|
5 | youtube.com | 144,502 (1.86) | ||
|
|
6 | facebook.com | 95,166 (1.23) | ||
|
|
7 | linkedin.com | 79,787 (1.03) | ||
|
|
16 | pscp.tv | 26,823 (0.35) | ||
| Online store | |||||
|
|
20 | amzn.to | 25,378 (0.33) | ||
| Scientific resourcea | |||||
|
|
—b | — | — | ||
| URL shortenera | |||||
|
|
10 | tinyurl.com | 44,768 (0.58) | ||
|
|
24 | trib.al | 21,409 (0.28) | ||
| Other | |||||
|
|
4 | paper.li | 204,077 (2.63) | ||
|
|
9 | google.com | 47,184 (0.61) | ||
|
|
12 | chng.it | 41,316 (0.53) | ||
|
|
18 | fiverr.com | 25,905 (0.33) | ||
|
|
21 | ift.tt | 23,304 (0.30) | ||
|
|
22 | avaaz.org | 22,938 (0.30) | ||
|
|
26 | arcgis.com | 18,604 (0.24) | ||
|
|
29 | worldometers.info | 17,670 (0.23) | ||
|
|
31 | yahoo.com | 17,588 (0.23) | ||
|
|
32 | apple.news | 17,584 (0.23) | ||
|
|
34 | openstream.co | 16,442 (0.21) | ||
|
|
36 | goo.gl | 16,310 (0.21) | ||
|
|
39 | joinzoe.com | 14,827 (0.19) | ||
|
|
44 | shoutcast.com | 13,635 (0.18) | ||
|
|
50 | dy.si | 12,343 (0.16) | ||
aLink category as extension of the list given in Chew and Eysenbach [31].
bNo domain qualified for a rank below or equal to 50. The full listing with all scientific resources under this category is found in Multimedia Appendix 5.