I'm in two, "tech lounge" and "ecommerce lounge". They appear along the top navigation alongside "timeline", "topics" and "Amazon". Each has dozens of companies in those industries and the most common topic is like the question the OP asked.
I know there is also a "hardware lounge" that Intel/AMD/Apple/Nvidia/etc are in but I'm not.
I figured there might be a finance one for people at banks and such.
I've been working here for a year. It is stable place. However I do not recommend it. Some Sortware Engineers must work on Agile workplace - It means you don't have own desk. First come first sit princip. You can't leave anything on workplace overnight, it will thrown away. And no PC, you have to work on virtual machine, horribly slow.
Friend works there; I've interviewed there. Good company, but a lot depends upon what you're looking for in this 'Blind' (literally) Era of high TCs. Type of team, asset class coverage, technology stack, etc. matters a lot.