The suggestions are notable because they come amid heightened scrutiny on the social media platform. Sen. Elizabeth Warren, another Democratic contender, has threatened to break up the company and other technology giants , while conservatives have accused Zuckerberg of censoring right-wing voices.

Zuckerberg and his wife, Priscilla Chan, recommended two individuals earlier this year who were ultimately hired, campaign spokesman Chris Meagher said. The recommendations came "around the launch when we were getting a ton of incoming resumes," Meagher wrote in a text message, confirming a report by Bloomberg News .

Facebook CEO Mark Zuckerberg has privately made hiring recommendations to presidential contender Pete Buttigieg, the Indiana Democrat's campaign confirmed Monday, revealing that the Big Tech executive has played a larger role in the 2020 election than was previously known.

Facebook has been accused of providing a platform for disinformation during the last presidential election, and has been criticized for refusing to remove ads for President Donald Trump's reelection that include false information.

The company has said it is taking measures to respond to the criticism. Zuckerberg is expected to testify on Wednesday to House lawmakers about Facebook's impact on the financial services and housing sectors.

Buttigieg has criticized Facebook and the other Big Tech platforms, though he has not gone as far as Warren. In April, Buttigieg said that he would empower the FTC to take on a heightened regulatory role when it came to Facebook and the other platforms. In May, Buttigieg said that Facebook co-founder Chris Hughes "made a very convincing case" about how Zuckerberg and other tech executives had too much power. Hughes has since left the company.

The two individuals Zuckerberg and his wife recommended are now on staff, according to Meagher. Both of their roles appear to include working with technology. Eric Mayefsky works as senior digital analytics advisor and Nina Wornhoff serves as organizing data manager.

Wornhoff joined the campaign in April after working as a machine learning engineer at the Chan Zuckerberg Initiative, according to her LinkedIn page. Mayefsky joined in June after working as the director of data science at Quora. He previously worked at Facebook from 2010 to 2013, his LinkedIn profile says.

Wornhoff and Mayefsky did not immediately respond to CNBC's request for comment. Zuckerberg, in a conference call with reporters later Monday, said his actions should not be taken as an endorsement.

"Since the beginning of the campaign, we've built a top-tier operation with more than 430 staff in South Bend and around the country," Meagher said in a statement provided to Bloomberg. "The staffers come from all types of background, and everyone is working hard every day to elect Pete to the White House."

Buttigieg, the mayor of South Bend, has performed well among donors in Silicon Valley since unofficially launching his presidential bid in January.