But many Twitterers in Rio are saying that the IOC was tricked into thinking the city is better than it really is.
Not all were negative. Some did tweet support for the bid.
Rio 2016's official Twitter account, @vivasuapaixao, which translates to "Live your passion" in English, posted updates during the visit.
Rio is hoping to host South America's first ever Games, and is competing with Chicago, Madrid and Tokyo. The winner will be announced in October.