The Celebrity: Donald Trump
Celebrities He Has Beefed With On Twitter: Mark Cuban, Cher, President Barack Obama
Why He Needs To Stop: The Donald has become a joke on Twitter this year. That's not to say that we ever took him very seriously on Twitter. But, he used to at least be entertaining. Now, we cringe when he tweets, especially when he tweets out insults about other celebrities. Stop embarrassing yourself, man.