You know which of your Facebook friends are annoying, but which ones are contagious?

A new app called "Help, I Have The Flu" scans your friends status updates for words like "sniffles" "coughing" and "flu.", This way you can see which of your pals may have passed it on to you.

The app leaves revenge up to you, offering once you track down the perpetrator to have them quarantined or send them some help.

If you don't have the flu, it's still a helpful app, it suggests which friends to avoid until cold and flu season is over.