Now is not the time to scream "DUH!" or "I told you so!" to people who in the past have not grasped just what they were agreeing to. Now is the time to help your less tech-savvy friends understand the impact their data has in aggregate (like swaying elections!), and how they have been used by this system. Take advantage of all this bad press and help people you care about stop contributing to this machine. If ever you were going to get someone to stop using these services, these are the moments you capitalize on.
I'm going to be using this thread as a perfect example when people think I'm crazy for saying that SV often exists in its own bubble. The disconnect here, and the failure of so many people to realize something so obvious, is appalling.