The municipal archives in the town of Selargius on the island of Sardinia is using Facebook as a tool to inform researchers about what type of information can be found in their archives, changes to hours of operation, initiatives or meetings that are planned, etc.
Archivio Storico Comunale Selargius
It's exciting to see them employing modern day tools to communicate with researchers around the world!
This town even has some digitized records online, including a few years of military conscription and inventories of their whole collection.
Biblioteca Comunale di Selargius