Here are the latest posts about Tumblr on Writers Write:
Tumblr's Traffic Growth May Have Flattened (2014-01-21): Comscore data indicates that Tumblr's traffic growth has flattened.
Yahoo Acquiring Tumblr for $1.1 Billion (2013-05-21): Yahoo is acquiring the Tumblr blogging service for $1.1 billion. Yahoo promises not to screw it up in a press release.
Rumor: Yahoo to Acquire Tumblr (2013-05-17): There is a rumor that Yahoo may acquire Tumblr. Yahoo will reportedly make the decison this weekend as to whether or not to pay $1.1 billion for the popular blogging platform.
MTV Launches a Tumblr (2011-06-13): MTV recently launched an official Tumblr.
Rapid Growth for Wordpress.com and Tumblr (2011-05-11): Royal Pingdom reports that Wordpress.
Tumblr Reaches 50 Million Active Monthly User Milestone (2009-08-11): More people are using the Tumblr tool to make short blogs.