Here is a presentation on Social Media as Ephemera. I did this for a Communications class. It looks at how important social media has become in the life of people and how it is worth libraries taking notice of them. Click on the link below.
Social Media as the new Ephemera
LetsTalkLibraries 
Quite an interesting subject. I suspect that this can also be a challenge for libraries that preserve the information like the Library of Congress that was mentioned in the PPT, with the rate at which persons use Twitter , Facebook or blog etc. universally! I saw at their website that they preserve a half a billion tweets every day! Thanks Nicolelei, this information was good to know.
Your presentation is very interesting! The challenge has always been to organize the ephemera for easy retrieval. Now that anyone can use tags it is a bit easier. I wonder how the LC is organizing them?