With almost 29 million Facebook fans, the 38-year-old overtook the Bad Romance singer, who still remains within a million fans of his overall total.
A statement by social media tracker Famecount reads: 'Within the last few hours Eminem has become the world's most popular living person on Facebook.'
Founder Daniel Dearlove added that Eminem's online fame has skyrocketed over the past six months.
He has also joined Gaga and Justin Bieber as the third star to reach one billion music video streams on YouTube.
Rihanna is third in the list of living Facebook celebrities and will more than likely be the next star to hit one billion YouTube views.