Social media detectives can relax ... Shaquille O'Neal says he is NOT the man in the PDA photo making the rounds all over the internet Tuesday.
If you haven't seen it yet ... the selfie was posted by Maria Ozuna Teachey to her 200K-plus followers on Instagram earlier this week -- and it featured her in front of a mirror with a large man's arms wrapped around her.
Because of the dude's size, many believed it was the Big Diesel -- after all, the dude appeared super tall and really buff -- and he seemingly had big hands and feet as well.