Facebook expanded its relationship with Definers Public Affairs in October 2017 after enduring a year's worth of external criticism over its handling of Russian interference on its social network.
The firm wrote fake news that blasted Google while downplaying the impact of Russian interference on Facebook.
Those articles were published on NTK Network, an affiliate of the firm whose content is often followed by politically conservative outlets, including Breitbart, the report says.
Definers Public Affairs also reportedly pressed reporters to explore Soros' financial connections with groups that protested Facebook at Congressional hearings in July.
Facebook's relationship with Definers Public Affairs were outlined as part of a broader report that looked at the company's handling of many scandals over the past three years, including Russian interference and the Cambridge Analytica scandal in March.
Other revelations in the report include Sheryl Sandberg's fury when a former security chief told the board of directors in fall 2017 about the full extent of Russian interference on the platform.