Biography: Think of this concept as word-of-mouth advertising, only with virtual strangers. When a lot of people tell you in real life that a business or product is reliable and of high-quality, you tend to believe them more than you would an advertisement because an advertisement has reason to lie to you, while a friend or family member does not. The same holds true on the Internet. When someone has a lot of subscribers, those who are browsing tend to think that the account is worthy of subscribers and the videos are worth watching.
