Tips on How to Avoid Consumer Fraud

From Western Union:

Beware of deals or opportunities that seem too good to be true.
Never use money transfer services when sending money to someone you don't know personally.
Do NOT use money transfer services to pay for online auction purchases.
Never send money to pay for taxes or fees on foreign lottery winnings.
Beware of someone who is giving you a check or money order and asking you to wire money back.

The maxim "If it's too good to be true, it probably is" works in most cases.