Best Free Document Viewer and Sharing

• Scribd, a great tool to upload and view documents of various formats in full screen, mark them private and accessible by a specific URL, share them with millions of readers, or embed the viewer into a website or blog.
  
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• SlideShare, search and download Powerpoint presentations from the web, or upload and share your slides, word or pdf documents publicly or privately. You can also view slides in full screen, or read transcripts and outlines.