Your 'last seen' time is a second layer of unwanted attention when you're desperately trying to avoid an awkward conversation. By heading to Settings Related: Secret Facebook features you need to try*Smiles*, *brags*, *accidentally presses delete* ..as simple as that, the number of that pretty girl/ guy is gone.
All is not lost, though, for there is a way to bring back messages from the dead.
Turn them off all the time, however, and suspicion might start to grow.
With the annual fee having long since been knocked on the head and video calling having finally landed alongside better video viewing, there's now nothing standing between you and endless chats.
That means it's time to progress beyond the basics and learn to become a Whats App wizard.
The new tidbit about the company's monitoring system comes from a Reuters interview with Facebook Chief Security Officer Joe Sullivan.
Here's the lead-in to the Reuters story: A man in his early 30s was chatting about sex with a 13-year-old South Florida girl and planned to meet her after middle-school classes the next day.
Facebook has added sleuthing to its array of data-mining capabilities, scanning your posts and chats for criminal activity.