
Announced within an official staff post, Tumblr plans to release a version of private messaging called “Fan Mail” which will allow Tumblr users to send private, personalized notes to other Tumblr bloggers. Rolling out over the next few days for all Tumblr bloggers, users will be able to find the new option at the top corner of followed blogs, in avatar drop-down menus and within the Tumblr inbox. Messages have been designed to have a unique visual style and appear in a handwriting font on a graphic of a sheet of notebook paper. Prior to Fan Mail, Tumblr users had to rely on a public email address to send another Tumblr user a message.

Tumblr currently has over 39 million blogs on the service that contain approximately 15 billion blog posts. While the company recently raised $85 million during a round of funding during September 2011, the blogging service wasn’t included in the Top Ten list of sites that drive social traffic to other sites according to Experian Hitwise. However, a similar visual site called Pinterest has been rapidly gaining traffic over the last two years.