Separate and Unequal 15-Year-Olds Share Close Share Share on Bluesky Why is Facebook not here? Why is Twitter not here? Share on LinkedIn Permalink Email David C. Berliner December 4, 2001 Author: David C. Berliner Institution: Arizona State University An op-ed piece on 2001 results of the Program on International Student Assessment. Report Expand Download Print Share Share PDF: Share on Bluesky Subscirbe to RSS Share on LinkedIn Why is Facebook not here? Why is X not here? Email Download or Print Permalink Copy Link Embed PDF: Copy Embed Code