That is an excellent question, but my first answer would be: Don't create several identities in the first place.
A lot of writers are so ready to be someone else that they feel the need to create pen names like crazy. I'd advise against doing this unless you are in a situation in which it is completely necessary.
For instance, I met a poet in Austin earlier this year who created a pen name because his job as a professor prevented him from publishing anything (including poetry) under his name unless it was approved by the university. I can understand changing your name under such circumstances. I can also understand creating a pen name at the suggestion of an agent or editor to help with sales.
However, I don't understand creating several identities without a good reason. It can get really confusing really fast.
That said, the best way to handle separate "brands"--because that's what you're essentially creating--is to have separate platforms. This means each persona should have a separate website, blog, social media accounts, etc. It's a lot of work, but there are ways to make it easier.
One way is to manage your social media accounts with a tool like Hootsuite, Seesmic, or Tweetdeck. Here are a couple reviews comparing these tools:
Click here to check out her website.)
But like I said, I think life is a whole lot simpler when we can just be ourselves 24/7.
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If you're here about how to handle actual multiple personalities, then here are some resources you might find useful:
- The Flock: The Autobiography of a Multiple Personality, by Joan Frances Casey, Lynn Wilson and Frances Howland
- Multiple Personality Disorder from the Inside Out, by W. Giller, Barry M. Cohen, Esther Giller and Lynn W.
- Becoming One: A Story of Triumph Over Multiple Personality Disorder, by Sarah E. Olson
- A Beautiful Mind, by Sylvia Nasar
- The Dissociative Identity Sourcebook, by Deborah Bray Haddock