What do people know about these "dark pools"? I was vaguely aware of them until recently, but since compiling my own trading software I've become much more interested in them. Apparently they are vulnerable to high frequency trading tricks such as latency arbitrage - which we will negatively affect anyone running an automated trading platform - but they do have upsides too. Must admit, I thought they'd be illegal for publicly listed companies, but apparently not. Thoughts.