https://www.techdirt.com/articles/20180717/15395340255/risky-click-adding-undercover-cop-as-friend-nets-man-conviction-gun-charges.shtml

Here's the thing about public profiles on social media services: they're public. If you don't want to be immediately arrested for committing criminal acts, maybe steer clear of social media. A multitude of examples can be found here at Techdirt, many of them covered caustically by Tim Geigner.

But it's not just bragging about bad behavior getting people caught. It's not being more selective about who you let into your online inner circle. It's not a new thing but it's only going to become more prevalent. "Friending" people you don't know is pretty much letting cops take a look around your place without a warrant.