br n any business, be it on or offline, understanding your audience is key to long-term success.br In the world of on-line marketing, where you may never actually see your audience, it becomes even more paramount. But just how do you understand a group of people who you have never met.br You probably spend a lot of time on Facebook, Twitter and writing carefully crafted emails to send to your list. But if you are sending promotions on an SEO product to people who could not care less about ranking on the search engines, then it is clear that you have no real clue who your audience are.