Donald Trump made history on May 5, 2016. He was the first presidential candidate to dominate a news cycle by tweeting a photo of a taco bowl.

Like Abraham Lincoln's speeches and Franklin Roosevelt's fireside chats, Twitter was Trump's trademark mode of communication throughout the 2016 campaign.

The former Atlantic City casino tycoon turned Republican nominee often says that the social media platform is a modern way to trumpet his message and respond to critics.

"It should be nothing you should be ashamed of," Trump said on "60 Minutes" in November. "It's where it's at."

But naysayers say the platform -- with its 140-character limit -- is a crude tool for someone in such a vaunted position. And Trump has often drawn fire for tweeting insults at his opponents, making remarks some deem racist, and pushing conspiracy theories, if not outright falsehoods.

Now that he's been elected president, many have called on Trump to delete his account. But he's shown no signs of that, let alone softening the tone of his feed.

So which of Trump's posts sparked the most controversy over the last 12 months? Here's a look:

1. Megyn Kelly a 'bimbo'?

Trump feuded on and off throughout the campaign with Fox News anchor Megyn Kelly and her parent network, at one point retweeting another Twitter user's post that called Kelly a "bimbo." The feud reached a fever pitch in January, when Trump skipped a Republican primary debate that Kelly was moderating. Just before the event, Trump tweeted:

I refuse to call Megyn Kelly a bimbo, because that would not be politically correct. Instead I will only call her a lightweight reporter! — Donald J. Trump (@realDonaldTrump) January 27, 2016

2. 'The worst president in U.S. history!'

Another favorite target of Trump's tweets: President Barack Obama. Especially when Obama lobbed criticism his way. Like this time in February:

Interesting how President Obama so haltingly said I "would never be president" - This from perhaps the worst president in U.S. history! — Donald J. Trump (@realDonaldTrump) February 17, 2016

3. The taco bowl

What do you do when you've faced backlash for making controversial comments about Mexicans and vowing to build a wall across the U.S.'s southern border? If you're Donald Trump, you apparently celebrate Cinco de Mayo by tweeting out a photo of yourself eating a taco bowl from a restaurant you own. (Even though some critics pointed out that it seemed that restaurant doesn't even serve tacos.)

Happy #CincoDeMayo! The best taco bowls are made in Trump Tower Grill. I love Hispanics! https://t.co/ufoTeQd8yA pic.twitter.com/k01Mc6CuDI — Donald J. Trump (@realDonaldTrump) May 5, 2016

4. Self-congratualtion after terrorist attack

In the wake of the Orlando nightclub attack -- the worst mass shooting in American history -- Trump took to Twitter to boast he was "right" to repeatedly warn that America needs to be more vigilant against "radical Islamic terrorism." Many felt that was in poor taste.

Appreciate the congrats for being right on radical Islamic terrorism, I don't want congrats, I want toughness & vigilance. We must be smart! — Donald J. Trump (@realDonaldTrump) June 12, 2016

5. A star of David?

In one of his many attacks against Hillary Clinton, Trump tweeted a photo showing his Democratic opponent against a backdrop of dollar bills with a message above her printed on a six-pointed star -- that many said looked like the star of David. Critics called it antisemitic. Trump changed the image but insisted it was actually a "plain star."

Donald Trump used a Star Of David to accuse Hillary Clinton of being corrupt https://t.co/rdbFtLBqO0 pic.twitter.com/5XXx3Oj2hb — BuzzFeed News (@BuzzFeedNews) July 2, 2016

6. Ripping into Ryan

When a 2005 video surfaced showing Trump bragging about forcibly groping women, one of the candidate's critics was U.S. House Speaker Paul Ryan (R-Wis.), the highest-ranking Republican lawmaker in the nation. Trump fired back with a string of tweets bashing Ryan and his own party:

Despite winning the second debate in a landslide (every poll), it is hard to do well when Paul Ryan and others give zero support! — Donald J. Trump (@realDonaldTrump) October 11, 2016

Our very weak and ineffective leader, Paul Ryan, had a bad conference call where his members went wild at his disloyalty. — Donald J. Trump (@realDonaldTrump) October 11, 2016

Disloyal R's are far more difficult than Crooked Hillary. They come at you from all sides. They don’t know how to win - I will teach them! — Donald J. Trump (@realDonaldTrump) October 11, 2016

With the exception of cheating Bernie out of the nom the Dems have always proven to be far more loyal to each other than the Republicans! — Donald J. Trump (@realDonaldTrump) October 11, 2016

It is so nice that the shackles have been taken off me and I can now fight for America the way I want to. — Donald J. Trump (@realDonaldTrump) October 11, 2016

7. (False) claims of illegal voting

Yes, Trump outpaced Clinton in the Electoral College to win the election. But many were quick to point out Clinton actually won the popular vote. Trump's response was to tweet an unsubstantiated claim:

In addition to winning the Electoral College in a landslide, I won the popular vote if you deduct the millions of people who voted illegally — Donald J. Trump (@realDonaldTrump) November 27, 2016

8. Consequence for burning the American flag?

Two days later, Trump issued a warning about those who burn the American flag -- even though many noted that what he threatened to do would violate the First Amendment.

Nobody should be allowed to burn the American flag - if they do, there must be consequences - perhaps loss of citizenship or year in jail! — Donald J. Trump (@realDonaldTrump) November 29, 2016

9. Trump vs. Baldwin

With only weeks to go before assuming the Oval Office, Trump took a moment to assume the role of television critic, taking aim at "Saturday Night Live" -- specifically, Alec Baldwin's impression of him on the show. Baldwin, a noted liberal, fired back.

Just tried watching Saturday Night Live - unwatchable! Totally biased, not funny and the Baldwin impersonation just can't get any worse. Sad — Donald J. Trump (@realDonaldTrump) December 4, 2016

...@realDonaldTrump



Release your tax returns and I'll stop.

Ha — HABFoundation (@ABFalecbaldwin) December 4, 2016

10. Causing Boeing's stock to fall

Two days later, Trump announced he planned to cancel an order from Boeing for a new Air Force One because of its cost. The aftermath: Boeing's stocks fell. That caused some critics to worry that Trump could single-handedly bully companies with only his Twitter account.

Boeing is building a brand new 747 Air Force One for future presidents, but costs are out of control, more than $4 billion. Cancel order! — Donald J. Trump (@realDonaldTrump) December 6, 2016

11. Going nuclear

Last week, Trump sent out an unprecedented tweet, even for him: calling for the U.S. to "expand" its "nuclear capability." One columnist wondered: "Could Trump start a nuclear war with a single tweet?"