This is a comprehensive guide on how to do the thing that is the title of this post.
#Destiny: act like you're famous and post about destiny lore, nerfs and buffs. Otherwise just become cancer incarnated.
#Feedback/#help: talk about nerfs.
#Community: pretend you're a community manager people will look up to you. They'll look up to cancer eternal.
#Recruitment: just carry people through raids and trials.
#Gaming: talk about current games until the next one's come out then talk about them. Etc.
#Offtopic: Gimmick
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I'm too shy to do any of these ;-;