You may want to edit your question to have a separate title (Topic/What are you trying to accomplish), and body (ask your actual question).
The link referred to is: Social Media Viz Contest | Tableau Public
You can download any dashboard from Tableau public and then using Tableau Public or Tableau Desktop you can see how it was created. Then, if you have specific questions on how a particular view was created or how a certain task was done, you can post it to the forums and there are plenty of people who'd love to answer!
Look for the dowload link in the lower right:
It's definitely important to note that the best way to be clear in a post is to have a clear succinct title and then more detail in the body of the post.
Unfortunately, that isn't always clear in the interface of the forums. This makes it look like you should type the entire question (which then becomes the title).