Once you log enough hours into a multiplayer game, you start noticing patterns. Things people like to do in games, sure -- but also what kinds of people you're likely to find in any given game.
This image by CANADIENxBOSS summarizes everyone from Halo and Minecraft and just about every game in-between perfectly.
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the types of people you meet online[CANADIENxBOSS]