in the photo below, its millions of sad faces made up into smiley faces. its suppose to symbol, that even though there are people that smile, there are a lot people who hide there sadness behind a fake smile of there own. A fact about depression: 
1.) Depressive disorders affect approximately 18.8 million American adults or about 9.5% of the U.S. population age 18 and older in a given year. This includes major depressive disorder, dysthymic disorder, and bipolar disorder.