Indexing the socmed skew

Hi y’all (or variants), would any of you have some form of Hirschman-Herfindahl index for the concentration in users/followers profiles on various socmed platforms ..?
And/or, even better, some index that takes into account every profile its geo- and other spreads which may be much more limited than all living in one global community you know.

Have pointers, will blog. Plus:
[Medium-class IIb for no good reason; Rotterdam]

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Maverisk / Étoiles du Nord