Tumblr Post Types Breakdown: 
Yahoo Labs (yahoolabs) tabulated a sample of 586.4 million posts and revealed this distribution of post types:

  • Photo: 78.11%
  • Text: 14.13%
  • Quote: 2.27%
  • Audio: 2.01%
  • Video: 1.35%
  • Chat: 0.85%
  • Question*: 0.82%
  • Link: 0.46%

*Question posts are text, photo, link, audio or video posts that allow answers for seven days. To create a question post, add a question mark (?) to the end of a post or caption to show and select the “Let people answer this” option.