![Tumblr sign up](https://webarchive.library.unt.edu/web/20130227231333im_/http://blog.aids.gov/wp-content/uploads/Tumblr-sign-up-150x150.png)
At AIDS.gov we continuously follow and research emerging social media tools for what may be the next big application. However, one of the big stories of 2011 wasn’t around an “emerging” tool, but one that had been with us since 2007. Tumblr is a social blogging site that that allows individual blog posts to be…