President Donald Trump speaks during the "Presidential Social Media Summit" in the East Room of the White House, Thursday, July 11, 2019, in Washington. (AP Photo/Evan Vucci)
President Donald Trump speaks during the "Presidential Social Media Summit" in the East Room of the White House, Thursday, July 11, 2019, in Washington. (AP Photo/Evan Vucci)
PHOTO: Evan Vucci/AP
Now playing
02:14
Trump hosts conservative social media personalities
WASHINGTON, DC - JUNE 24:  Microsoft principle founder Bill Gates participates in a discussion during a luncheon of the Economic Club of Washington June 24, 2019 in Washington, DC. Gates discussed various topics including climate change.  (Photo by Alex Wong/Getty Images)
WASHINGTON, DC - JUNE 24: Microsoft principle founder Bill Gates participates in a discussion during a luncheon of the Economic Club of Washington June 24, 2019 in Washington, DC. Gates discussed various topics including climate change. (Photo by Alex Wong/Getty Images)
PHOTO: Alex Wong/Getty Images
Now playing
01:18
Bill Gates thinks government needs to regulate Big Tech
Now playing
02:09
Early Facebook investor: It's time to rein in big tech
Google CEO Sundar Pichai greets attendees during an event at the Mayes County Google Data Center in Pryor, Oklahoma, June 13, 2019. Nick Oxford for CNN
Google CEO Sundar Pichai greets attendees during an event at the Mayes County Google Data Center in Pryor, Oklahoma, June 13, 2019. Nick Oxford for CNN
PHOTO: Nick Oxford for CNN
Now playing
04:12
Google CEO reacts to growing calls to break up big tech (2019)
PHOTO: CNN Business
Now playing
02:41
Google and Facebook are great at selling ads. It's terrible for journalism
Now playing
03:03
Is Google a monopoly?
Facebook
Facebook's CEO Mark Zuckerberg delivers his speech during the VivaTech (Viva Technology) trade fair in Paris, on May 24, 2018. (Photo by GERARD JULIEN / AFP) (Photo credit should read GERARD JULIEN/AFP/Getty Images)
PHOTO: GERARD JULIEN/AFP/Getty Images
Now playing
03:21
This is how Facebook kills its competition
TOPSHOT - The US Capitol is seen in Washington, DC on January 22, 2018 after the US Senate reached a deal to reopen the federal government, with Democrats accepting a compromise spending bill. / AFP PHOTO / MANDEL NGAN        (Photo credit should read MANDEL NGAN/AFP/Getty Images)
TOPSHOT - The US Capitol is seen in Washington, DC on January 22, 2018 after the US Senate reached a deal to reopen the federal government, with Democrats accepting a compromise spending bill. / AFP PHOTO / MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
Now playing
02:22
Will the government attempt to break up Amazon?​
ROBBINSVILLE, NJ - AUGUST 1:  Boxes travel on conveyor belts at the Amazon Fulfillment Center on August 1, 2017 in Robbinsville, New Jersey.  The more than 1 million square feet facility holds tens of millions of products, features more than 14 miles of conveyor belts, and employs more than 4,000 workers who pick, pack, and ship orders.  Tomorrow Amazon will host a jobs fair to hire 50,000 positions in their fulfillment centers nationwide.  (Photo by Mark Makela/Getty Images)
ROBBINSVILLE, NJ - AUGUST 1: Boxes travel on conveyor belts at the Amazon Fulfillment Center on August 1, 2017 in Robbinsville, New Jersey. The more than 1 million square feet facility holds tens of millions of products, features more than 14 miles of conveyor belts, and employs more than 4,000 workers who pick, pack, and ship orders. Tomorrow Amazon will host a jobs fair to hire 50,000 positions in their fulfillment centers nationwide. (Photo by Mark Makela/Getty Images)
PHOTO: Mark Makela/Getty Images/FILE
Now playing
04:14
Is Amazon a monopoly?
Attendees wait in line for a 5G exhibition at the Qualcomm booth during CES 2019 consumer electronics show, on January 10, 2019 at the Las Vegas Convention Center in Las Vegas, Nevada.
Attendees wait in line for a 5G exhibition at the Qualcomm booth during CES 2019 consumer electronics show, on January 10, 2019 at the Las Vegas Convention Center in Las Vegas, Nevada.
PHOTO: ROBYN BECK/AFP/Getty Images
Now playing
01:44
Qualcomm violates antitrust law, judge rules
PHOTO: Photo-Illustration: Shutterstock/CNNMoney
Now playing
02:41
Can Amazon afford to get into the ad business?
NEW YORK, NY - JUNE 17:  The Apple logo is displayed at the Apple Store June 17, 2015 on Fifth Avenue in New York City. The company began selling the watch in stores Wednesday with their reserve and pick up service. Previously the product could only be ordered online. (Photo by Eric Thayer/Getty Images)
NEW YORK, NY - JUNE 17: The Apple logo is displayed at the Apple Store June 17, 2015 on Fifth Avenue in New York City. The company began selling the watch in stores Wednesday with their reserve and pick up service. Previously the product could only be ordered online. (Photo by Eric Thayer/Getty Images)
PHOTO: Eric Thayer/Getty Images
Now playing
02:23
iPhone owners can sue Apple over App Store monopoly
Tim Wu
Tim Wu
Now playing
02:34
Tim Wu: This is how you break up Facebook
(CNN Business) —  

Facebook (FB) released the results of a year-long, independent investigation of the company’s alleged anti-conservative bias on Tuesday. Although Facebook (FB) has made some progress in eliminating anti-conservative bias, the company still has work left to do, the investigators say.

The eight-page report, conducted by former Republican Senator Jon Kyl and others at the law firm Covington and Burling, LLP, outlines concerns about Facebook’s policies and the ways in which Facebook has already addressed them. The audit came at Facebook’s request last year, following repeated claims of anti-conservative bias, including from President Donald Trump.

The report concludes that Facebook’s efforts to counter misinformation have silenced some conservative voices on the platform. For example, some of the website Facebook relies on for fact-checking or flagging misinformation are considered by conservatives to be left-leaning. And Facebook’s ads policy may have inadvertently restricted some anti-abortion advocacy.

Included the report is a new policy, in which Facebook will allow ads with images of people with medical tubes, as long as people featured are not in visible pain or distress and there are no blood or bruises. This change will likely benefit those who post ads for pro-life organizations and children’s advocacy groups.

Former Senator John Kyl
Former Senator John Kyl
PHOTO: Zach Gibson/Getty Images

Kyl’s report says Facebook’s previous policy on what they called “sensational” advertisements meant that pro-life ads that “focused on survival stories of infants born before full-term” were rejected from the platform. The policy “has been applied unevenly in the past,” Facebook’s VP of global affairs and communications Nick Clegg acknowledged in the blog post published Tuesday about the audit.

Although Kyl acknowledges several steps Facebook has taken over the last year to counteract anti-conservative bias, the report argues that the work is far from finished.

“Facebook has recognized the importance of our assessment and has taken some steps to address the concerns we uncovered. But there is still significant work to be done to satisfy the concerns we heard from conservatives,” the report reads.

Clegg said Tuesday that Facebook will continue to examine and adjust its practices.

President Trump and other conservatives have used allegations of political bias as a talking point against Silicon Valley companies like Facebook and Google. Last month, Trump hosted a “social media summit” as a forum to address the concerns. However, the White House did not invite representatives from the companies themselves.

For the audit, Kyl and his team met with 133 conservative lawmakers and groups, starting May 2018. Their names are not included in the report. The team presented preliminary findings to Facebook in August 2018 and conducted follow-up interviews in May 2019.

Kyl and his team summarized the interviewees’ concerns into six categories: content distribution and algorithms; content policies; content enforcement; ad policies; ad enforcement; workforce viewpoint diversity.

Interviewees said they believed Facebook’s algorithms suppress articles from conservative news sources, for example. Other tech platforms, such as Google (GOOG) and Twitter (TWTR), have faced similar allegations.

“From the Ivy League to Hollywood and the mainstream media, Americans with traditional morals or conservative politics have often felt excluded from the country’s elite, culture-creating institutions,” Kyl wrote in a Wall Street Journal column published Tuesday.

The report and the op-ed outline the policy changes Facebook has made in response to the audit over the last year. For example, Facebook announced last month it would create an oversight board for appeals on content removal.

Clegg said the audit is “ongoing” and Kyl and his team will issue another report in a few months.