Some Facebook pages that include Baja California history:
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Baja California Land of Missions Book Group
CONOCIENDO LAS CALIFORNIAS (Fotografias de la Baja California Antigua)

Other notable Facebook pages: 
Viva Baja Group
Baja Overlanding
RVing in Baja
Slow Baja Community
Sierra San Pedro Mártir Group
Hidden Baja
Baja Lovers
Baja Visitor Community
Puertecitos Happenings
Know of other interesting, non-commercial Facebook pages? Submit your nominations to add here. Email them to info@vivabaja.com