Overfiendvip - Best place to contact me is on Discord (Oν), but I will probably still catch your message if it's elsewhere instead (Twitter, Twitch, et cetera). I usually respond pretty quickly, assuming I'm at my computer.
foosda/andrew - I tend to idle on SRL IRC pretty frequently, and rarely check my Twitch messages.
Ponk - Best contacted on Discord or on twitch (Ponktus). Editing and gathering alot of data for the wiki and also researching alot on misc. categories.
Total/Tewtal - Owner of the wiki.
Aran;Jaeger/EternisedDragon - I have Discord up about every day and can be contacted in SM related servers (mainly SRL - Super Metroid & Metconst) there most of the time, but I'm also frequently on the lookout for SM streams on twitch so that one could find me there, too.