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Rihanna Police Track Alleged Stalker ... After Gun Threats

Rihanna’s alleged stalker is about to have cops crawling up his cyber ass ... searching his online accounts after RiRi got a terrifying gun threat on social media.

Law enforcement sources tell TMZ … LAPD will scour the records of someone who goes by Alex Mercer and Ralph Alexander on Twitter and Yahoo. We're told the guy posted a selfie of himself on April 30 outside Rihanna's former home.