However, there has reportedly been a notable increase in positive fan-generated content.
Research conducted by social media intelligence platform Hootsuite for Newsweek revealed the gulf in content produced about the Sussexes dwarfed the amount centred on the Waleses.
Eileen Kwok, social marketing specialist at Hootsuite, told Newsweek: "Meghan and Harry are the most talked about couple on TikTok—but the conversation tends quite negative with most people being highly critical about their relationship.
"While #HarryAndMeghan has 5 million views under its hashtag, #WilliamAndKate has only 715K views.
The Duke of Sussex leaving the Rolls Buildings in central London
"TikTokers are also comparing the couple, but have taken an even closer look at Meghan and Kate specifically—and they're taking 'sides'.
"The comment section for videos revolving around the Royal Family are heated with advocates and critics of their every move—from their behavior and fashion sense, to their looks and interactions."
Hootsuite’s 30-day period of study suggested the number of posts were broadly equal between the two couples.
The Princess of Wales had the most views over the period in question at 397,000.
The Princess of Wales, the Prince of Wales and the Duke and Duchess of Sussex walk to meet members of the public at Windsor Castle
However, overall data revealed Prince Harry had the most posts at 140,000 and most views at 13 billion.
Meghan Markle finished behind her husband in second with 115,000 posts and 11 billion views.
Princess Kate had 65,000 posts and 10 billion views.
Prince William meanwhile languished behind the trio on 79,000 posts and 11 billion overall views.