If you are a gay man you certainly know what Grindr is all about. But if you are a gay man with a business mind you might want to know the story behind what apparently is the most widely used gay mobile phone app in the world. In an interview with Bloomberg, Grindr founder Joel Simkhai explains that he launched the Los Angeles-based app business in 2009 with only $5,000 and no outside investors. Today Grindr boasts more than 2 million daily users with year-over-year revenue growth of 29 percent. Grindr is active in 192 countries, including homophobic places such as Iraq and Afghanistan. Watch the video above to learn more.