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Republican presidential nominee Donald Trump arrived for his election night rally at the New York Hilton Midtown in Manhattan, New York, U.S., November 9, 2016. (REUTERS/Andrew Kelly/File Photo)

Posting on Twitter is Donald Trump's thing.

From when he claimed that North Korea developing nuclear weapons "won't happen!" to that time he criticized Arnold Schwarzenegger about his movie rating, the president-elect has not eased up on tweeting. Sometimes, however, his tweets lack evidence or are based on conjecture, which have sparked controversy.

1. Probably the most covered and outlandish of his social media posts, Trump tweeted a few weeks after the election that aside from winning the Electoral College, he also would have won the popular vote had it not been for the "millions of people who voted illegally."

False. The claim stems from a series of tweets by former Texas Health and Human Services Commission deputy commissioner Gregg Phillips when he wrote: "Completed analysis of database of 180 million voter registrations. Number of non-citizen votes exceeds 3 million."

However, Phillips has not revealed any evidence or data in regard to these now-debunked claims.

2. In a tweet directly mentioning the New York Times, Trump announced that the publication sent a letter to their subscribers apologizing for "bad coverage" of him.

False. The New York Times published a letter to its readers in response to the election results with the suggestion: "Did Donald Trump’s sheer unconventionality lead us and other news outlets to underestimate his support among American voters?" The publication went on to say that it will "rededicate" itself to its journalism mission and thanked loyal readers and subscribers. While the Times said it "underestimated" the results, it did not apologize for any "bad coverage."

3. Trump claimed on Twitter in November that he was already having an impact as president-elect when he said that he helped keep the Kentucky Lincoln plant from moving to Mexico.

Once again, false. The company never said that it was going to move its Kentucky plant to Mexico. "Ford said it will keep production of the Lincoln MKC at the plant. It had planned to shift production of the MKC to another plant and Mexico was a likely location," CNN Money reported.

4. In a slight change of topic, Trump also suggested on the social media app that the former Miss Universe Alicia Machado and topic of conversation during one of the presidential debates, made a sex tape.

False. While Machado has been photographed topless and appeared in a suggestive scene on a Spanish reality show, it has not been confirmed that she participated in a sex tape. Aside from the validity of her participation in a sex tape, Trump suggesting Clinton helped her become a U.S. citizen to use her in a debate is also unsupported by any facts and was denied by State Department Deputy Spokesperson Mark Toner.

5. About a month following the election, the CIA announced that there was information about Russian-hacking possibly influencing the U.S. election. Trump decided to tweet that the timing of the announcement was fishy.

False. Experts, like Barak Klinghofer, co-founder and chief product officer at Hexadite, a company that analyzes cyber threats, have debunked Trump's tweet. Klinghofer told USA Today that it is possible for attackers to leave footprints behind.

"Cyber criminals always leave evidence behind and forensic cybersecurity capabilities have advanced to the point where we can identify and analyze hacks faster than ever before," he said.