Let the Buyer Beware Share Close Share Why is Facebook not here? Why is Twitter not here? Share on LinkedIn Share on Google Plus Permalink Email Peter W. Cookson, Jr., Alex Molnar, and Katie Embree January 1, 2001 Institutions: Columbia University and Arizona State University An analysis of the social science value and methodological quality of educational studies published by the Mackinac Center for Public Policy (1990-2001). Research Brief Expand Download Print Share Share PDF: Why is Facebook not here? Why is Twitter not here? Share on LinkedIn Share on Google Plus Email Download or Print Permalink Copy Link Embed PDF: Copy Embed Code Executive Summary Expand Download Print Share Share PDF: Why is Facebook not here? Why is Twitter not here? Share on LinkedIn Share on Google Plus Email Download or Print Permalink Copy Link Embed PDF: Copy Embed Code Press Release Expand Download Print Share Share PDF: Why is Facebook not here? Why is Twitter not here? Share on LinkedIn Share on Google Plus Email Download or Print Permalink Copy Link Embed PDF: Copy Embed Code