Insider spoke to five sets of twin cofounders to find out what makes them tick. The twins say dividing up tasks and constant communication helped them grow. Some like to market their "twindom," but others fear it looks like a gimmick. Read more about the twin cofounders at the link in our bio. Story by Ryan Hogg. (Credit: Milena Ugrinova; Joshua Galloway; Getty Images; Anna Kim/Insider)