By inviting trans users to submit anonymously, Dear Cis People provides a candid look at the entitlement, sexism and transphobia that trans folks deal with on a regular basis.
According to the site, it is meant to be "a means of opening a communication line from people who are often silenced, either inadvertently or otherwise." The term "cis" as in "cisgendered" refers to people who are not transgender. Many trans people prefer to use "cis" instead of terms that attempt to draw distinctions based on biological sex or gender.
Source: dearcispeople.tumblr.com
Source: dearcispeople.tumblr.com
Source: dearcispeople.tumblr.com