So, I've got about 250 powerpoint presentations, each one linking to a different post on my blog. They are high quality, all are different (although they have the same theme) with different text, etc. I want to upload them to sites like Authorstream, scribd, etc. I'm working on creating a brand, so I'm going to create a username that is the same brand as my blog and make it an official account for the blog. I'm going to upload them all to authorstream because they rank well and I also have had some traffic from it in the past with previous presentation. When I'm done, is it safe to upload them all to other presentation sites like scribd, slideshare, etc.? or would this be duplicate content and cause some kind of penalty?