I'm a bit foggy on the "meta-data" thing
I'll try not to get too fancy, but basically metadata is data about data. For instance, this website as you see it and the information within it is data. If you have a Windows computer, hit Ctrl+U. The window that pops up is what the website is made up of, or the metadata.
You'll notice that you can still find posts within the websites metadata, but that's because this website is open source and full of information. The metadata in its rawest form is simply the framework of the site. In other words, if you were to be given only the raw metadata from this website, you would be able to reconstruct only a very small, insignificant portion of it with minuscule amounts of useful information, if any at all.
Hope this helps.