The articles Zemanta suggests come from 300 or so "top media
sources" as well as the other blogs of Zemanta users. The images
suggested come from Wikimedia Commons, flickr, and stock photo
providers like Shutterstock and Fotolia. Zemanta also pays close
attention to copyright, making sure that suggested content is licensed
as Creative Commons or approved by stock providers, so you won't get
into trouble by using Zemanta's service.
As a blogger, to get your content "Zemified," you'll need to install the Firefox extension,
as the only supported browser at this time is Firefox. Once installed,
you only need to visit one of the supported blogging platforms and
begin to write your post.
While you write, you will notice a new Zemanta sidebar added to your
post editing page, which will fill with related content as you type out
your entry. The more you write, the better the Zemanta recommendations
will be, but each entry should be at least 300 words for Zemanta to
work properly. Zemanta is English-only for now, but you may have luck
if writing in another language if the content you're writing about
involves trademarked items or well-known buzzwords.