SECRET GAYS EXPOSED: Markeith 'THE GAY HUNTER' Rivers . . . Catches Another Allegedly DOWNLOW GAY MAN On Social Media . . . Makes Him 'BEG' On Video!!

Markeith Rivers is a popular gay social media star - who likes to "expose" downlow gay men.

According to Markeith, he believes that "downlow gay" men need to be publicly OUTED.

And last night, he just "exposed" someone else on social media.

Look: