The Internet has been a huge boon for information-seekers. In addition to sites maintained by newspapers and other traditional news sources, there are untraditional sources ranging from videos, personal Web pages and blogs to postings by interest groups of all kinds -- from government agencies to hate groups. But experts caution that determining the credibility of online data can be tricky, and that critical-reading skills are not being taught in most schools. In the new online age, readers no longer have the luxury of depending on a reference librarian's expertise in finding reliable sources. Anyone can post an article, book or opinion online with no second pair of eyes checking it for accuracy, as in traditional publishing and journalism. Now many readers are turning to user-created sources like Wikipedia, or powerful search engines like Google, which tally how many people previously have accessed online documents and sources -- a process that is open to manipulation.

Marcia Clemmitt is a veteran social-policy reporter who joined CQ Researcher after serving as editor in chief of Medicine and Health, a Washington-based industry newsletter, and staff writer for The Scientist. She has also been a high school math and physics teacher. She holds a bachelor's degree in arts and sciences from St. Johns College, Annapolis, and a masters degree in English from Georgetown University.