Commercial Activities in Schools Share Close Share Why is Facebook not here? Why is Twitter not here? Share on LinkedIn Share on Google Plus Permalink Email September 1, 2000 Source: United States General Accounting Office A report by United States General Accounting Office (GAO) to Congressional Requesters. Report 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