No.

A tip, though:

Videos posted on Slideshare have shown incredible traffic levels, so that's worth looking at

Who's going to want to read a 'slide show' presentation of a blog post? The Internet doesn't want that crap. I know I don't want to look at it. Do you?

Duplicate content is when you have the same content on the same website.

The same content on different websites is known as syndicated content and websites do it every day of the week. There are a lot of perfectly good reasons for websites to syndicate content -- a lot of news websites do this all the time.

What matters is who posted that content first. You won't likely get any Google love for a piece of content you post that has been indexed previously on another website but you won't likely get penalized for it either.

This isn't duplicate content at all. Actually it's a smart way to leverage the content you already have.

Let's say you write an article. Then you make a presentation that summarizes the article. Then you use the slides to record a video presentation on youtube. Then you take the audio from the youtube video and share that etc.

It's called leveraging your content.

Who said about making your content crappier?

With different content styles you reach different audiences. Not promoting the same thing to the same audience.

It's all about working smarter.

It is what we call Content Syndication, which is normal.
Remember RSS? It is the same idea.

It is alright that the content went viral in various platform.

I will be soon posting a thread that how to create multiple streams of traffic with one article. Drop you a note when it is posted.