SlideShare is an online platform for sharing presentations that was acquired by LinkedIn in 2012. It allows users to upload files like PowerPoint presentations publicly or privately. Although originally for business use, it now hosts a huge number of slideshows for public viewing. With over 60 million users and 159 million monthly page views, SlideShare is a popular way to share knowledge and can be used for marketing if content is well-designed and valuable and keywords are optimized.