These are the most confusing questions Congress asked Zuckerberg
You can use Facebook for free. Maybe you are very happy about that. Well, Facebook gets all your personal information for free and they earn huge from your data from advertisement. That's their business model. Once you share anything on Facebook, now you don't know what's actually going on behind the scenes. Let's watch this video.
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Basically, Facebook earns advertising from the customer by using cookies, which save in device when a customer uses Facebook on his devices.
They have a lot of information about us. You might forget what you like or what you love in particular time, but Facebook shows you ads. Your private life is not private anymore. Thank you for your comment!