There are plenty of scams running rampant around the internet, but especially so this time of year. Remember, if the IRS needs to get a hold of you, they will not send an email.
Use some common sense to avoid becoming the person to lose money in a scam. If no one fell for these things, they wouldn't be so common.
Your bank will never needs your social security number, your account information never needs to be updated from an email, someone didn't just buy something from you on eBay if you haven't listed anything for sale, the email from someone you've never heard of with the offer of a job you didn't apply for is not legit, and the foreign minister from Zimbabwe does not need you to help him recover his $1,000,000.