There is some very authoritative information available on the web, and there is also less reliable information. To evaluate sites, consider these criteria:
Purpose: What is the purpose of the site? To inform? To persuade?
Authority: Who is the author of the webite and what are the credentials of that person or entity? The author may be an individual or an organization.
Timeliness: How current is the information? Can you tell when it has last been undated?
Scope: How deep is the website? Is it within your range of comprehension? Is it too simple? Is it too technical?
National Association of Social Workers The National Association of Social Workers (NASW) is the largest membership organization of professional social workers in the world, with 150,000 members. NASW works to enhance the professional growth and development of its members, to create and maintain professional standards, and to advance sound social policies.
Information for Practice (IP) is sponsored by New York University's School of Social Work and is intended to help social service professionals throughout the world to maintain an awareness of news regarding the profession and emerging scholarship. It is a monthly digest and you can subscribe to it on the "about" page.
Child Welfare League of America serves children and families through its member network of nearly 800 public and private agencies across the U.S.
National Center for Charitable Statistics is a clearinghouse for data on U.S. nonprofit organizations and develops and disseminates quality data on them and their activities for use in research.
Kaiser Family Foundation is a free site "dedicated to filling the need for trusted, independent information on the major health issues" of the US. It contains information and analysis for a wide range of readers, from policy makers and health care practitioners to journalists and the general public. The site also serves as a clearinghouse for important heath policy news and can be browsed by topics or by report type.