According to my expertise in information technology, it seems that the type of database being described is a distributed database. Like mentioned in the question this is a database that works by saving information in data centers from various locations and information is processed through multiple database node. This allows information to be more secured, faster, and also acts as a fail-safe in case of any malfunction where data may otherwise be lost.
social networking sites allow users to share ideas, digital photos and videos, posts, and to inform others about online or real world activities and events with people in their network.
