In short, how do you spot the snake-oil among information supplements?

FORBES: How to Distinguish Between a Honest Online Entrepreneur and a Hustler With a MacBook Air

Referee Poll was sharp-eyed enough to spot Keane's hand snake out to block Campo's goalbound header and the penalty award was doubled up as the Spurs captain was red-carded for denying a goalscoring opportunity.

BBC: SPORT | Football | Premiership | Tottenham 4-1 Bolton

The most obvious is quality control: the market is infested with snake-oil salesmen, and they are harder to spot from half a world away.

ECONOMIST: Schumpeter