It's no secret that the millennial generation rules the internet. Born between 1980 and the mid-2000s, they're the first age group to truly come of age in the Internet era. As a result, millennials live on social platforms like Facebook, Instagram and Twitter. Because they frequent social sites, they're an ideal audience for ecommerce sites, mobile gaming companies and other businesses that also exist in a primarily digital world. Before you start creating and targeting ads to millennials, here are some important facts to keep in mind.