There are some sites which require either Yahoo, Disqus and or Google (blogger, Youtube) names to enter each sites forums if you want to make a post or comment.
The best example is if you have a Youtube account, then automatically...you have a Google account.
You don’t have to have a goo gle account to view You Tube. If you want to comment or upload videos, then, yes you do. SO if that is the case, make up a fake yahoo, aol or whoever email address and use it for nothing except to get the account. Hide your IP while you make the account and every time after that. Change your IP frequently. Right now when I click on Goo gle it shows I am in Austin Texas. I can assure you I’m far away from there.
Where goo gle thinks I am:
Austin, TX
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I am so not there.