One topic in particular has captured the twittersphere in recent days: front row seats to Monday's event at Hofstra University. After Dallas Mavericks owner and "Shark Tank" investor Mark Cuban tweeted that he'd be in the front row to support Clinton, Trump fired back with a threat to give a seat to Gennifer Flowers.
Since then, Trump supporters have been mentioning Flowers on Twitter more often than Clinton supporters have talked about Cuban, according to the data. Cuban has continued to badger Trump on the social media site. Here's one example of his many anti-Trump tweets:
Conversations about the other side have increased, especially for Clinton supporters. In the last 30 days, Clinton supporters talked about Trump in about 25 percent of their tweets, while only mentioning Clinton in 10 percent. That gap is much larger than the approximately 6 percent point difference in July.
The gap for Trump supporters also increased as the polls have begun to narrow. In July, they tweeted about Clinton 3 percentage points more often than they did Trump; that's up to 5 percent in the 30 days ended on Sept. 20.
Activist investor Carl Icahn is one business leader tweeting his support for Trump:
Disclosure: CNBC owns the exclusive off-network cable rights to "Shark Tank," which features Mark Cuban as a judge.