SlideShare is a useful web 2.0 slide hosting service that allows users to upload and share presentations publicly or privately. It was launched in 2006 and is now owned by LinkedIn. SlideShare has over 60 million monthly visitors and is used by many organizations and individuals for education, business, and marketing purposes. Some key features include embedding slides on other sites, commenting and sharing. It competes with sites like Scribd but also partners with companies like LinkedIn and Google.