No one at Facebook seems to know who hired a DC opposition research firm

Main Idea: Facebook cut ties with Definers Public Affairs after a report said the firm helped run a campaign against critics, while Mark Zuckerberg said he did not know who hired it.

Key Points:

• The New York Times reported that Definers helped push misleading stories about Facebook critics through conservative websites.
• Zuckerberg said he learned about Definers only after the report came out and denied that Facebook asked it to spread false claims.
• Facebook said the firm had tried to link an anti-Facebook group to George Soros, which the company denied was meant as an anti-Semitic attack.
• The company’s top leaders said they were unaware of the firm’s role, but Facebook’s own statement suggested some staff knew about the work.