[imnotjames]

In practice, yes. They did.

I have worked at another organization (hosted server provider) where I was in contact with the FBI and other law enforcement.

There's a world of difference between what was shown they did at twitter by noting things that were "worrisome" or against a reasonable site's ToS and forcing anyone to take things down.

I have told agents that certain materials were acceptable and that we would take no action. Not much they could do there without an actual warrant.