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:
Also, it's smart to study how someone who's successfully pulling off multiple identities does it. The first contemporary person who comes to mind for me is Julianna Baggott, who actually has at least three identities: Julianna Baggott, N.E. Bode, and Bridget Asher. (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