Former Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonHillicon Valley: FBI chief says Russia is trying to interfere in election to undermine Biden | Treasury Dept. sanctions Iranian government-backed hackers The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters FBI chief says Russia is trying to interfere in election to undermine Biden MORE jabbed President Trump Friday for disputing media reports about the size of the crowds at his January inauguration.

“Some are even denying things we see with our own eyes, like the size of crowds," Clinton said during a commencement speech at Wellesley College, her alma mater. "And then defending themselves by talking about 'alternative facts.' "

In January, Trump was incensed after photographs and public transit statistics proved that his inauguration crowds didn't measure up to former President Barack Obama Barack Hussein ObamaThe Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon Trump appointees stymie recommendations to boost minority voting: report Obama's first presidential memoir, 'A Promised Land,' set for November release MORE's 2009 swearing-in. White House press secretary Sean Spicer defended the crowd sizes in a press conference, while Trump blasted press reports about his inauguration audience in a speech at CIA headquarters.

ADVERTISEMENT

Clinton struck a serious tone when talking about the importance of reliable information in the face of conspiracy theories and social media.

“You are graduating at a time when there is a full-fledged assault on truth and reason,” Clinton said.

“Just log on to social media for 10 seconds, it will hit you right in the face.”

The former secretary of State went on to knock right-wing media.

“People denying science, concocting elaborate, hurtful conspiracy theories about child abuse rings operating out of pizza parlors,” she said, referencing the "Pizzagate" conspiracy theory that inspired a man to fire shots in a Washington, D.C., pizzeria.

Clinton also called for unity and denounced speech that creates "rampant fear."

“Drumming up rampant fear about undocumented immigrants, Muslims, the poor. Sowing division at a time when we desperately need unity,” she said.