A cool little infographic from Union Metrics, looking at the top 10 brands on Tumblr:

For the purposes of this research, we looked at the entire conversation happening on Tumblr, so this is beyond just individual brand blogs. This allowed us to understand the organic conversations that were being driven by fans. Fun fact: In the month of data analyzed, the top 10 posts about each brand were created by fans.

The Top 10 Brands on Tumblr