So Google has your search history, websites visited, ads clicked, gmail, hangouts, documents, maps and satellite imagery, encryption services (crowdstrike).
Facebook has instant location information, geo-tagged pictures, video and audio. Millions of spy phones all over the world. Facial recognition. You can be tagged even if you are not a member. Likes, dislikes, personality building AI tracking software. They can build a virtual (you) to anticipate your next move. Your next concert, your next restaurant. When you will need to pull over to fill up with gas.
What could they do with this information? ANYTHING THEY WANTED!!! Bank information, friends and contacts. Employment information. Where you were when you called in sick that day. Control = Power.
Ever wonder why all these "services" were free? Most governments would KILL for this information. We gave it to them for nothing.