The Internal Revenue Service is trawling social media profiles in search of evidence that people aren't declaring everything they should on tax returns, according to a lawyer who works on privacy and data security issues. The IRS denies poring over taxpayers' Facebook profiles, but analysts say people should still be cautious about what they post online, as such a process would be legal. "If you claim a deduction on your income tax returns, but the lifestyle you lead has manifested in social media that is inconsistent with that deduction, that would be a red flag," former judge Andrew Napolitano says.

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