The Facebook currently counts more than 950 million users with an average monthly time spent on the social network of 6.5 hours. As is logical, equally outrageously high levels ranges and volume of data to keep them in the databases of each like, share, comment, status update etc to be recorded individually.
According to statistics released by the actual Facebook:
The social network for collecting user’s data volume 500 terabytes per day
Each day about 2.5 billion shared objects (status updates, likes, comments, photos, and video), made 2.7 billion likes and 300 million photos are posted
One of the largest Hadoop (HDFS) clusters of Facebook has 100 + pet bytes capacity
Every half hour scanned 105 terabytes of data from the query language Facebook Hadoop, Hive
Every day in the databases of Facebook made 70.000 queries
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