Regardless of Elon Musk’s claims, the number of Americans who use Twitter as a personal billboard is declining. Twitter earned 89 million dollars from its US ad business between the first and second weeks of April and the first week of May. That’s a 59% decrease year on year. It’s a difficult break for the company. Ad sales are a significant source of revenue for Twitter, and Elon Musk purchased the company with the sole intention of turning it profitable.