Interest in Facebook has waned significantly over the past couple of years.

According to research from SimilarWeb, monthly visitors to the social media giant has decreased dramatically.

Facebook's monthly page visits has dropped from a sizeable 8.5 billion to 4.7 billion since 2016. That's a decrease of 3.8 billion views per month.

SimilarWeb has looked at traffic numbers from five big sites - Facebook, YouTube, Google, Amazon and Yahoo. Of all of these sites, YouTube is the most impressive regarding growth.

"For several years, the top five largest sites in the United States have remained stable. Now we are on the edge of a paradigm shift," said SimilarWeb chief of insights Stephen Kraus.

"Our projections show that soon YouTube’s traffic will pull ahead of Facebook to become number two, and Amazon’s traffic will soon pull ahead of Yahoo to become number four.

"If current trends continue, both flips will likely occur in the next two to three months."

Though, While Zuckerberg's numbers are dwindling - Facebook-owned Instagram and WhatsApp are still doing just fine. Users on Instagram are now spending 56 minutes a day on the app, which is more than double the 27 minutes on average last year.