The real difference between whoisi and other sites is the way that keep track of your friends. Much like an RSS reader where you add feeds of people you know and keep track of them, whoisi asks you do do the same. Except that you're asked to create entries for your friends first and add all of their feeds. That small amount of work that you've done makes it easier down the road for someone else to come along and follow that person as well. Your friends don't have to participate in whoisi for you to be able to keep track of them, but if they do down the road, you've made it much easier for them.
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