the police needed a warrant to get this info from Facebook.

In the USA there's due process required for authorities to gain access to your private data, not true in many countries.

As always, don’t talk with police, and don’t discuss illegal activity unencrypted or connected to your real life identity.

A person has to assume anything put out there over the internet or phone network can be inspected under criminal investigation. One has to be a dumb ass not to realize that. I've even seen stories of criminals making social media posts showing off their robbery loot. Also the style of wearing their pants falling down. Make sure to trip and fall when running from the cops. Good thing criminals make it easy for police.

Yeah, always invoke your right to remain silent. I watch a lot of crime shows, actually my wife is more into it than me so I get roped into watching them. It baffles me how criminals will sit there and let police interrogate them until they confess. Maybe it's because they think they can talk their way out of it, but then why confess. As a US citizen you can shut down an interview with police any time you want. But it's good suspects are stupid like that, makes it easy for police. They have a tough job dealing with all the knuckleheads out there.