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. 2020 Aug 28;22(8):e19629. doi: 10.2196/19629

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.