Not only are there delays in projects when people leave and new ones must be brought up to speed, but knowledge falls through the cracks.

FORBES: The Key to Keeping Your Employees: Do It the Old-Fashioned Way

Private service professionals must know when to enter and leave a room, when to be present but unnoticed, how to tactfully update a principal with household information.

FORBES: Modern-Day Downton Abbey: Inside The Super-Secret World Of Estate Management

Foreign journalists with video cameras are still working in central Iraq, but now circumstances are such that when they leave their fortified compounds, they must travel in pairs of cars, accompanied by armed guards.

ECONOMIST: Iraq documentaries

Miss Widdecombe must have disappointed supporters when she suggested she would leave politics to care for her mother.

BBC: The rise of the virgin politician

Morsi's words must be followed closely, but they must be matched against his actions, especially in the longer term, when the cameras leave Tahrir Square, the place where Egypt's revolution started with calls for real democracy and equality.

CNN: Can we trust Egypt's new president?

But it must be easier to leave Facebook now than it was just a few months ago when the social network was the hottest, fastest growing, most exciting company on the planet.

BBC: Tech City gets top boss