Градация каналов socialblade.com

bratka_panya:
На сайте http://socialblade.com есть градация каналов youtube
D- A+ и так далее, можно ли где-то найти более подробную информацию, что за градация и из чего она складывается.

'When SocialBlade was created we first just listed rankings based on # of subscribers and # of views, but it quickly became evident that this was not an accurate indicator of how people were actually doing on youtube. Someone could have a bazillion subscribers that they cheated to get but not have any actual views. The SB ranking system aims to measure a channel's influence based on how many views they are actually getting, how they are doing networking wise (i.e. who has them in their box), and other factors. If you have a A+, A, or A- SB rank then consider yourself very influential on youtube. If you're not there quite yet don't fret, just keep up the good work!''
(Copy from SocialBlade FAQ/Help page)