2014
2015
2016
2017
2018
2019
2020
Facebook
48
49
50
51
52
53
53
Instagram
20
24
28
30
32
34
35
Twitter
15
16
18
19
20
21
21
Pinterest
14
16
17
18
19
19
20
Tumblr
6
7
7
8
8
9
9