Ellen DeGeneres: Tweeted an insensitive photoshopped image of riding Usain Bolt

Elizabeth Warren: DNA test results tweet backfired.

Jeremy Corbyn: Various tweets leading to controversies over anti-Semitism.

Ted Cruz: Liked a pornographic tweet, causing embarrassment.

Sarah Palin: Tweeted about the "Lamestream Media".

Boris Johnson: Tweeted insensitive remarks about various topics.

Rudy Giuliani: Unintentionally tweeted a link to an anti-Trump website.

Alexandria Ocasio-Cortez: Faced backlash for a video of her dancing in college, though it later turned out to be a positive moment for her.

Donald Trump: Numerous controversial tweets, including attacks on opponents.

Hillary Clinton: "Pokémon GO to the polls" tweet mocked for being out of touch.