If you haven't noticed it then perhaps it isn't so bad.
Yes, people do this frequently. It's not always obvious. I'll attempt to mitigate duplication by retweeting different tweets of my articles, or slightly varied content. I also keep a list of when I tweeted what, so it's spaced over time. There's services that do this automatically, but I don't use them.
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I think I wouldn't enjoy that. Then again, I've never seen anyone actually doing that.
It might be because I'm not a Twitter user. Are people commonly working around Twitter algorithms like that?
If you haven't noticed it then perhaps it isn't so bad.
Yes, people do this frequently. It's not always obvious. I'll attempt to mitigate duplication by retweeting different tweets of my articles, or slightly varied content. I also keep a list of when I tweeted what, so it's spaced over time. There's services that do this automatically, but I don't use them.