(CNBC) You consider yourself a law abiding citizen, and you are not starting a nonprofit organization with conservative ties.

Even so, you may be a candidate for a tax audit—and you may have no clue what you have done to warrant the attention of the IRS.

The nation’s tax collectors have long made it a practice to look for discrepancies, omissions and suspicious activity to uncover tax evasion and fraud. And lately, the IRS has expanded its monitoring to include social media.

The agency now keeps an eye out for online discussions about nonpayment or underpayment of taxes, and even sale prices of goods on sites like eBay that don’t match what taxpayers report.

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