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The email address is the first, most logical step and honestly this is a huge portion of the anonymity story as it relates to identities being spread around the web when a system is compromised. Consider the data that many sites request on signup: name, location (possibly your exact address), date of birth, phone number etc.
If protecting your identity is indeed important to you, consider what these values should be.
A great alternative where an email address is simply a requirement to entry and you care little about anything that's actually sent to it is to use a Mailinator address.
I'm going to focus on what's readily accessible to the bulk of the population.
If you don't want your participation in certain sites going public, then this will be useful.
It doesn't matter if you don't agree with the lifestyle choice of those on the site and certainly I myself am not one to look around the house at everyday items and think "I wonder if that could...".
That's entirely beside the point though which is that a bunch of consenting adults now have their identities in the hands of an untold number of people who are willingly sharing the data around web. I've had this post in mind for some time as I've seen more and more deeply personal data spread across the web.