If their companies let them, business travelers using the latest version of TRX's corporate-booking tool, RESX, can book their trips and then share them on TripIt and Facebook.
After making a booking using RESX, travelers would get prompted — if their companies enable the feature — to share trips with their TripIt and Facebook networks.
Then again, perhaps company A won't want parts of the TripIt network to find out that its business development officer is traveling to company B for fear that someone in company C might find out.