The New Museum’s exhibition specific Tumblr around The Carsten Holler Experience is a perfect example of museum to visitor interaction on Tumblr. Their team compiled a prolific amount of user generated content from around the web - Tumblr, Twitter, Flickr, and Facebook - to document the experience between the visitors and the incredibly interactive installations.
The museum also offered some original photography of behind the scenes happenings, such as the installation process, that would otherwise be seen by only museum staffers. This practice gave followers a more complete narrative to associate with the exhibit, and in turn generated even more interest.
The New Museum now has a more general Tumblr regarding museum happenings that can be found here.