How do some photographers on Flickr get so successful?

How do some of the photographers on Flickr get so successful or well-known?

With some,i fully understand why because their work is pure quality,but some people are no different to unknown photographers,yet still get all the credit and recognition. Why/how is this?

What have these 'successful' people done to get so well-known?

What is a VPN?

VPN is (Virtual Private Network) were first used by companies to enable their employees to securely access internal systems such as email remotely (e.g. from home or while on business trips). Today they are increasingly being used for personal use by individuals to protect their privacy while online in public places (e.g. when using the wi-fi connection in a cafe) or in a country where the internet is censored / blocked (e.g. China, Saudi Arabia…).