More than any previous election, the 2016 Presidential campaign has been waged on social media. Both candidates have made big news via campaign tweets. And pivotal shifts in the roller coaster campaign have emerged first on social platforms.

Here are 12 of the most retweeted tweets that, for better and for worse, have defined the 2016 Presidential race.

Her name is Alicia Machado. #DebateNight

— Hillary Clinton (@HillaryClinton) September 27, 2016

"Such a nasty woman." —Donald Trump just now #DebateNight

— Hillary Clinton (@HillaryClinton) October 20, 2016