Meriem recently forwarded the following slideshow on to me. It is a deep insight study by faberNovel Consulting into the phenomenon that is Facebook. Lots of colour and pretty engaging. If you're interesting in social networking or are working with Facebook at all, this is definitely worth a scan. It was released in September, which probably already makes it mildly out of date given the speed of change online, but nevertheless. Worth a look.
On the same note, check out the Slideshare website for more interesting presentations on all sorts of things. You can also download the actual pdf file from the site using this SlideShare Link