Helping people with computers... one answer at a time.
Most sites that require registration and an e-mail address do not make that information available for searching. In fact, they shouldn't.
I want to find out what public sites my email address is attached to. Is there a website that I can go to, put my e-mail address in, and have it scan and tell me if my email address was used on sites like MySpace or anything else that I have signed up for?
The short answer is no, there is no place to find out where or what sites are using your e-mail address for registration.
However, there is at least one interesting thing you can do to find out how your e-mail address is being used.
One of the most powerful and interesting things you can do to find out if your email address is being used somewhere is simply to Google it. You should do it every so often, and you'll probably be surprised.
Every time you enter your email address into a web form or a comment field you run the risk of having that email address published publicly on the web. In fact, in rare occasions, sites will use your registration information, including your email address, as your signature when you post information. In any case, having your email address posted publicly on the web is simply a way of getting more spam. As I've said before, you should never intentionally put your email address into a comment or other posting, and you should avoid services that do it "automatically" for you.
You'll note that in comments to articles on Ask Leo! while I ask for your email address to be able to contact you, I do not actually publish your email address publicly.
A site that is designed properly with privacy in mind will never display an email address unless you explicitly instruct it to. For example, there is simply no way to know what email addresses are associated with MySpace accounts. MySpace does a good job of hiding, or rather keeping, the information of its members private, and in doing so prevents exactly what you're looking for. In fact, most sites that require email registration do the same.
But, the only way that I know of to find out if your email address is used on any given site is to attempt to use it. Perhaps ask for a password reminder. If it works, then you'll know not only that your email address is used on the site, but you'll have your password to access it once again. In some cases, sites will tell you right away if the email address cannot be found in their records which also tells you that your email address isn't there.
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