Because text can be extracted from PowerPoint files, presentations don??™t suffer from
the same metadata challenges that photos and videos do.
SlideShare has created a clever tagging system that marries aspects of Flickr and Del.
icio.us. In SlideShare any other user can tag your slides as long as they mark your
slides as a favorite. A favorite is just like a bookmark within SlideShare; it??™s a way
for you to find the presentations that you like. (In the model discussed in Chapter 3,
SlideShare users are tagging a pointer to the file.)
This favorites system (see Figure B .8) creates a collaborative tagging environment
where each user has their own tags that can be aggregated for each presentation.
SlideShare can then use this aggregate view to give users a sense of what each presentation
is about and even which presentations are more representative for each tag.
Another interesting aspect of tagging on SlideShare is how it mixes object-centered
sociality with metadata collection.
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