1) Date of Tumblr Launch: February 2007
2) Number of Tumblr users: 550 million monthly users
3) Number of Tumblr Blogs: 280.4 million blogs
4) Average Daily Tumblr Signups: 120,000
5) Number of Tumblr Posts: 129.7 billion posts
6) Average number of daily Tumblr posts: 53.3 million
7) Average Tumblr visit length: 28 minutes
8) Total Monthly Tumblr Visitors (Global): 199.1 million
9) Percentage of Tumblr’s audience that access it through a mobile device: 78%
10) Tumblr mobile engagement growth from 2012-2013: 251%
11) Number of times the average Tumblr post is reblogged: 14 times
12) Revenue per visit from Tumblr referrals: $.70
13) Tumblr’s most reblogged Food of 2015: cake
14) Tumblr’s most reblogged Book of 2015: The Harry Potter series by J.K. Rowling
15) Tumblr’s most reblogged City of 2015: New York City
16) Tumblr’s most reblogged Liberal art of 2015: feminism
17) Tumblr’s most reblogged News topic of 2015: Black Lives Matter
18) Tumblr’s most reblogged Media blog of 2015: BuzzFeed’s Tumblr
19) Most reblogged Fashion trend on Tumblr in 2015: Grunge
20) Most reblogged Fashion brand on Tumblr in 2015: Nike
21) Tumblr’s most reblogged Talk show hosts of 2015: Jon Stewart
22) Tumblr’s most reblogged Pop culture topic of 2015: Zayn leaves One Direction
23) Most reblogged Author on Tumblr in 2015: John Green
24) Tumblr’s most reblogged Politicians of 2015: Barack Obama
25) Most reblogged Reality star on Tumblr in 2015: Kylie Jenner
26) Most reblogged Models on Tumblr in 2015: Kendall Jenner
27) Most reblogged Actor on Tumblr in 2015: Chris Evans
28)Most reblogged Actress on Tumblr in 2015: Zandaya
29) Most reblogged Athletes on Tumblr in 2015: Serena Williams
30) Most reblogged Band on Tumblr in 2015:5 Seconds of summer
31) Most reblogged Solo Musician on Tumblr in 2015: Taylor Swift
32) Most reblogged Music Album on Tumblr in 2015: Blurryface by Twenty One Pilots
33) Most reblogged Movie on Tumblr in 2015: The Avengers: Age of Ultron
34) Most reblogged Video game on Tumblr in 2015: Pokemon
35) Most reblogged Sports on Tumblr in 2015: Hockey
36) Most reblogged Meme on Tumblr in 2015: Pepe the Frog