This app tells you your personality by looking at your Tumblr account. You should really check it out. This is my result:
INFJ PERSONALITYThe INFJ personality type is very rare, making up less than one percent of the population, but they nonetheless leave their mark on the world. As Diplomats (NF), they have an inborn sense of idealism and morality, but what sets them apart is the accompanying Judging (J) trait – INFJs are not idle dreamers, but people capable of taking concrete steps to realize their goals and make a lasting positive impact.