The stream
Every user on Facebook has two feeds. There's a personal feed, which you'll find on your profile page along with your photo and list of interests. Every time you log a status update, comment, or video post, that interaction is captured and stored for your review; those changes also become fodder for a second news feed that runs on your home page, the first page you see when you log on to the site.
That feed keeps tabs on all the interactions your friends are having (and alerts friends to updates you've made on your personal feed). If your brother RSVP'd to a dinner party, for example, you might be notified about it, even if you weren't invited to attend. And if you change your profile photo, it may let your brother know. Like Facebook itself, the feeds are subject to the network effect: The more data you share and interact with, the more robust your news feed becomes.
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