Since I noticed the ability for Slashdot to change ratings on messages based on my friends list, I've started adding more and more of the "enlightened" people I notice to my friends list.
I've given a +2 bonus modifier to my friends so I can see what those people whose opinions I've previously valued have to say (and also notice if they never again have anything useful to say).
What I'm finding interesting now that I've reached a couple dozen people on my friends list is how many people I click the neutral circle on and discover that they are a friend of at least one of my friends. It seems that birds of a feather really do
At any rate, it was interesting to me.