SlideShare supports presentations, documents, pdfs and videos. You can upload these and share with your LinkedIn network. 

Formats supported are :

• Presentations: pdf, ppt, pps, pptx, ppsx, pot, potx (Powerpoint); odp (OpenOffice); key, zip (Apple Keynote).
• Documents: PDF, doc, docx, rtf (MSOffice); odt, ods(OpenOffice); Apple iWork Pages.
• Videos: Read FAQs for supported formats and codecs.