What actually happened was someone photoshopped an image of Kacey’s profile, the Likes section specifically, to show her “liking” that Kid Rock tweet. When Kacey saw that, she assumed she was hacked, and issued a statement.
Yes, a photoshopped image can quickly turn into a total shit storm in the blink of an eye on social media. People photoshop tweets all the time, they go viral, making it look like someone tweeted those actual words, when they did not. Then, they take that fake tweet, post it on Reddit, and wait for it to go viral.
While this case wasn’t an actual tweet, the fake “like” was plenty to stir up wild non-existent controversy between Swift and Kacey.