That means you have to register with Forbes.com using a valid email address.

FORBES: Tax Horror Stories Giveaway

Liberty Reserve is a company that allows users to apply for an account through the Internet by simply supplying a valid email address.

WSJ: Costa Rica: Digital currency site founder arrested

Users are then responsible for registering a single account with a valid email address, credit card details along with a billing address (alternatively, a valid Paypal ID).

FORBES: European Courts Rule In Favor Of Consumers Reselling Downloaded Games

That means you have to register with Forbes.com using a valid email address, allow me to DM you on Twitter or message you on Facebook (depending on how you choose to enter the contest).

FORBES: Congress Needs Some Advice in 2012

Kelly had received a confirmation email from the airline, suggesting the fare should be valid under the new rules.

CNN: Too good to be true: New York to Hong Kong for $43

How many of us when reading an apparently valid link in an email would bother to check whether the link is actually valid or whether instead it takes you to a malicious site.

BBC: Viewpoint: How hackers exploit 'the seven deadly sins'