This infographic is useful to know what particular data each tech company is mining from you. This shows a list of basic details you share with the companies. Apart from these the companies may collect much more data than you know.
For example Google collects facial recognition data. Did you ever wonder how simply Google Photos tags people in photos by their faces? That's how facial recognition works.
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Imagine what they can do with this data of yours. Many of these tech companies are building supercomputers that can process algorithms at a rapid pace. They can analyze hundreds of user's data and form a map to establish you into categories as per their requirement.
If you don't wake up and stand up for your privacy, you will have none left.