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Several weeks ago I noticed the first of what might be a growing trend of adding email address to a mailing list without allowing the user to choose whether to opt-in or opt-out of the list.
The first instance of this I noticed was a flash-based online petition being run by a presidential candidate's campaign in a popular site's BlogAds. I had never noticed a "signable" petition in the BlogAds, and signed it to satisfy my curiosity for how it worked. I presumed that after entering my email address and pressing submit I would be taken to a page to complete a form with my name and be given an opt-in/opt-out for the candidates email list. Surprisingly, that did not happen, and I was just thanked for signing the petition right there in the ad. Not surprisingly, I began receiving emails from this candidate.