Which usernames do you recognise?
mixmax: I recognise quite a few. Off the top of my head is tpcatek, cperciva and dfranke because of their expertise, mechanical_fish, nostrademons, jacquesm, jasonlbaptiste, mattmaroon and tokenadult because they often have something intersting to say, markbao because he's a great entrepreneur at a young age, and danielbmarkham because he has life experience.