With FriendFeed, you list the people you want to keep in touch with. They let us know what services they use (e.g., Flickr or Facebook or Picasa Web Albums), and you get a personalized feed of what they are up to.
using web crawling technologies
or for services that contain private data and require special forms of authentication, FriendFeed takes advantage of the APIs provided by those sites to collect your activity.
You can only use the imaginary friends feature to track the public information your friends publish
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