It’s a site where you can see anyone’s (channel, social media) statistics. In the past, I would use this after a show would appear on something popular, just to observe the bump, and how long it lasts for. Sometimes I’d analyze someone who went on a controversial show where you’ll gain and lose subscribers, but to then see how things turned out… Sometimes I like to observe a newer channel, especially after “endorsements” or YouTube gossip (usually political/comedic channels).
I’ve only gone on there a few times, but I just see that it will even show the most recent video uploaded. Lots of rankings (and then sub-rankings according to their category), as well as how much $$$ earned (approximate, I’m sure).
Regardless, please post anything you find interesting, especially if it surprised you.