1. Facebook has over 1.86 billion monthly active users who spend on average 20 minutes per visit, showing the significant time users spend and engagement on the platform. 2. Big data collects extensive personal information about users from various sources like search history, purchases, social media activity, and locations to build detailed user profiles. This includes demographics, relationships, interests and more. 3. While users often do not realize the value of their personal data, one study estimated the average worth of personal data per person at $3,241, showing data to be a very valuable asset in the digital economy.