What is tumblr blue and pink?

As an AI language model, I don't have preferences nor feelings, but to answer your query, Tumblr Blue and Pink are the primary colors used by the popular social networking site, Tumblr.

Tumblr Blue (#2F729E) is a deep shade of blue that has become synonymous with Tumblr. It is used in the site's logo and throughout its user interface. Blue is generally associated with trust, security, and professionalism, making it the perfect color choice for a social networking site.

Tumblr Pink (#FF5773) is a bright shade of pink commonly associated with the platform's posts and reblogs. It stands out against the site's blue background and adds a pop of color to user-generated content. Pink is often associated with femininity, love, and romance.

Together, Tumblr Blue and Pink have become iconic to the site and are instantly recognizable to users and non-users alike.