The Queen, at 87, is scaling back her work, and the prince is taking up the slack, to the potential detriment of his network of charities, initiatives and causes".
It was said to be part of a charity initiative.
His faith-based charity initiative is encountering doubts from some churches.
Another poster, identified as Tim R., wrote: "If Groupon is launching a charity initiative, it needs to explain this by revising the Super Bowl ads.
The double prank formed part of the Prank It Forward charity initiative, which uses pranks to raise awareness for good causes and donates $1 per 1,000 YouTube views.
On Thursday the Football Association supported Time to Talk Day, a charity initiative by Time to Change that encouraged people to discuss mental health issues.
In an exchange of tweets with Graduate Fog, he points out that it's a one-off charity initiative, and that "we offer internships at no cost".
Some were hastily reorganised into village halls, as the jubilee coincides with the Big Lunch, a charity initiative designed to get communities to spend time together.
He said he was a proud supporter of the charity initiative, which is aimed at getting young people involved in their communities.
Safe Water Network, a charity initiative focused on providing underserved populations with clean drinking water, established its first site in the village of Nizampally, India.
Nearby was a glossy red teaching skeleton, called Mr. Bones, that he created for a Kiehl's charity initiative in May, and a box of labels for Creme de Corps, one of the company's most popular products, waiting for his autograph.
