SlideShare is a large document and presentation sharing social network with 60 million monthly visitors. The author conducted a test to see which types of links embedded in uploaded files on SlideShare would be indexed by Google. He uploaded a PDF, Word file, and PowerPoint with different link types to nine unique pages. Only one page was indexed - one that was linked to from a hyperlinked URL in a PDF. Therefore, to have links spidered from SlideShare, use PDFs with hyperlinked URLs.