• Facebook Inc (NASDAQ: FB) Oversight Board blogged that it reviewed the social media company's practice of maintaining separate sets of rules for high-profile users "XCheck."

• The Board has also probed Facebook's rendering of selective users as immune from enforcement actions called "whitelisting." The probe follows the Wall Street Journal's report on the system.

• The Oversight Board has reached out to Facebook and expects a briefing shortly.

• Facebook previously told the Oversight Board that it only used the system in a small number of instances.

• Separately, Facebook recently highlighted dedicating 40,000 employees and investment of over $13 billion on safety and security.

• Price Action: FB shares closed higher by 0.5% at $357.48 on Tuesday.

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