forgotten usernames

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well people who have answered my earlier thread " fake names ..." would think why i have gone crazy over names.Anyway here is my another question we are interested in joining many sites and we have many user names for those sites but have you ever forgotten your user name in the site which you have joined . have you ever joined twice in the same site and later realized that you have already been there well i had an experience of forgetting my usernames at different sites and now i am maintaining a record on sites that i have joined and also their usernames