Re: WARNING About Digg (Please Read)
If you do the math, you'll figure out that it's impossible for the social sites to mine their data and figure out what the voting rings are. I did a big post on this on my blog last week. As long as you only vote about 50% of the submissions of your friends it's impossible for them to find you other than 1) Randomly tripping over you, or 2) Investigating you specifically based upon some other flags. Reverse engineering the voting rings out of the data is devilishly hard. That's why there are so many sites getting away with openly selling diggs, stumbles, etc.
Do some research on computation of functional determinants from data. It's order N log N, and we're talking very large values of N here. Just cover yourself with lots of other votes for other stories and act in a natural way and you can cooperate with rings of friends without fear.
The real mistake is to vote primarily for your friends (on the site's) stories. You've already notified the site that the two of you are friends, so they can look through a lot less data. Rather than shouting through the site, do it through IM/email/another site/etc.
People get caught because they do stupid things, like run a script for 24 hours voting a story every 5 seconds, or being 1 of 5 votes on a spam story. That will pop you to the top of "most active" and makes it easy to investigate.
Be careful of the voting ring sites. I'm waiting for the social media site developers to wake up and use something like the social limit script to figure out if people have visited one of those sites based upon their browser history and then targeting those people for a roll up. The fact that none of them are doing that points out to me that they aren't nearly smart enough to attack the functional determinant problem.
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