Communication providers are the next obvious targets. This includes your postal provider, your telephone provider, your internet service provider, your email provider, and, increasingly, social media platforms.
All of these services can build quite detailed social graphs, and governments around the world are keen to demand that these providers do so. The social media platforms do it deliberately so they have something to sell to advertisers.
Moglen isn't wrong to be paranoid about this, he's just wrong to think that opting out entirely is a viable answer. It's like saying "people can see everything you do on the village green, you should stay home and never go outside!".