FYI: A subtweet is a shady tweet about someone, but it doesn't mention their name. All of these are alleged, but we can pretty much figure out who/what their talking about.
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When Louis Tomlinson subtweeted Zayn after he left One Direction and took a Macbook pic with Naughty Boy:
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When Katy Perry subtweeted Taylor Swift once news of their feud went public:
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And Katy did it again after Taylor's "Bad Blood" music video:
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When Rihanna subtweeted Ciara after she called Rih rude and said, "Trust me, Rihanna, you don't want to see me on or off the stage."
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When Kim K subtweeted Amber Rose, who called her a homewrecker:
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When John Legend subtweeted Chris Brown in 2012 (!!) after Chris apparently told John to keep his "bitch on a leash."
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When Lady Gaga subtweeted Katy Perry for her Gaga-esque looks in 2014:
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When Adam Levine subtweeted Lady Gaga, saying she recycles old art:
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And then Gaga subtweeted back:
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When Meek Mill subtweeted Drake during their infamous beef of 2015:
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When LeBron James subtweeted Kyrie Irving after Irving allegedly asked to be traded, so he wouldn't be in LeBron's shadow:
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When Britney Spears subtweeted Katy Perry in the classiest way after Katy made a head-shaving joke at the Grammys:
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When Sarah Michelle Gellar tweeted this after Kim and Kanye were on the cover of Vogue in 2014:
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When Demi Lovato subtweeted Perez Hilton, who was at her concert:
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And when Demi subtweeted Halsey after Halsey hinted that "Cool For the Summer" was problematic .