A tenet of the social studies profession is that critical thinking is fundamental to good citizenship. The skills of critical thinking include collecting information from multiple perspectives, evaluating it carefully, and then applying new insight and understanding to answer a question or make a decision. In today's wired society, students of all ages have access to virtually unlimited and unfiltered information on the Internet. This makes the teaching of critical thinking skills in the elementary social studies classroom important and timely, as these skills are far too important in today's technological and multimedia society to delay their introduction until middle or high school. The author of this article enumerates three reasons why it is imperative to teach critical thinking to young students using the Internet: (1) The Internet is a powerful teaching tool for social studies at all grade levels, if used wisely; (2) The vast amount of unfiltered information on the Web poses a real dilemma for social studies teachers; and (3) The same Internet dilemma provides a great opportunity for teachers to help students develop critical thinking skills. This article also includes a list of criteria and a rubric for evaluating Websites. (Contains 3 tables and 6 endnotes.)