The delicate flowers of Twitter.
Blocking, muting, closing their eyes, plugging their ears...
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Much as blocking can be a tool for that, it also serves a similar function as simply not following certain people: it ameliorates boredom.
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I've never had any reason to block anyone personally (no trolls, etc.), but plenty of times I've blocked some idiot people keep retweeting into my feed.
The people who retweet said idiot may have otherwise interesting opinions, so it's like a partial unfollow.

