Teiganism

(1) The practice of openly or covertly maintaining multiple distinct identities, either online or offline

(2) Possessing, for better and/or worse, an exceptionally undefined and mutable personality / sense of self

You're having a Facebook conversation with a joke account you created for your kettle!? This disturbs me; it's tantamount to Teiganism.

Lyn Hershman's creation of Roberta Breitmore would today be referred to as 'Teiganism', but in fact predated the invention of the term by forty years.