Followers (2017) on Netflix

Plot summary

The followers who watch Brooke and Caleb online see nearly everything the pair does. The two of them set out on a camping trip and keep posting updates the whole way, so anyone paying attention knows where they are and what they are doing. What Brooke and Caleb do not know is that one person has decided to make an example of them, to show how simple it is to track somebody down in the digital age. That person is already close to the campsite, and the followers gathered there are prepared to go to extreme lengths to make the point.