Sure you have tons of Facebook friends, 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, naturally, "flu" to see which of your pals may have passed along that gift that keeps on giving, the influenza virus.The app leaves any requisite revenge plotting up to you, offering once you track down your particular Patient Zero, "you may choose to have them quarantined or if you're particularly forgiving, send some help." If you don't have the flu, the app's still useful, suggesting which friends to avoid IRL -- in real life -- until cold and flu season's over