It looks like Slide Share makes available a lot more than slides.
Linked In is protected by safe harbor under the DMCA as long as it removes infringing links, and also removes repeat infringers.
Here is Linked In's page to report infringement.
Some commentators feel that it is a waste of time to bother trying to take down piracy links because they are usually re-uploaded in a short period of time, however, there is a glimmer of justice on the horizon.
As Adi Shoval reports for Pearl Cohen, Cox Communications was recently fined a billion dollars for not removing repeat infringers (in this case, music infringers) from its platform.
The jury awarded $100,000 for the piracy of over 10,000 individual music works.
Meanwhile, just one senator is holding up the #CASEAct. For anyone active on Twitter, the CopyrightAlliance is asking creators and their friends to use the hashtag #AskWydenWhy and to tweet @RonWyden.
All the best,