The news that music retailer HMV was going into administration was broken to the world by one disgruntled ex-employee who hijacked the company’s Twitter account and tweeted “There are over 60 of us being fired at once!" among other pithy comments that concluded with a final update reading: "Just overheard our marketing director (he's staying, folks) ask 'How do I shut down Twitter?'”

Managing the temptation for your IT staff to be constantly online to ensure they don’t burn out and make costly mistakes requires good management and personal responsibility.

Some extreme personalities may be good for business, but there’s one that most would steer well clear of: The corporate psychopath.

Anybody who has spent time in an office environment has stories about the extreme characters they work with, from the loud-mouth who can’t keep a secret if it will get him or her a laugh to the manager who takes credit for his or her employees’ work or who is quite happy to humiliate junior staff in public.