It's clearly best/biggest of type, hence i was highly motivated. That didn't last long. It's a very typical kind of website: looks slick but has a clunky interface and worse 'help'. I waded through its ratings process [rate 20 books or die!], when i didn't need GR recommendations.
I was there to meet people. I gathered the only way to do that is to join a "discussion group". But i couldn't even find any, much less join one. I'm tired of fighting interfaces [of apps too] so i gave up. I should've had more patience? Funny, that's what they all say.