2017-07-12 UTC
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puckipedia Gargron: it's pretty efficient. when a status appears, we trigger so-called FanOutOnWrite. it looks at the followers of the account who posted it (local or remote), for each follower we put the message on their home feed, the write-layer cache, a redis sorted set that contains the IDs of the statuses on each user online for the last 2 weeks