The newspaperO Estado de S. Paulo said the group was the main network of support for far-right presidential candidate Jair Bolsonaro on the internet.
The paper's joint investigation with Avaaz said the posts reached more than 12.6 million Facebook interactions in 30 days,a numberO Estado characterised as unsual,given those achieved by popular social media stars such as footballer Neymar (1.1 million) and singer Madonna (442,000).
Bolsonaro is expected to win a run-off on Sunday in Brazil's most polarised election in a generation in which social media has become the main battleground between the candidates.
Facebook said RFA created pages using fake accounts or multiple accounts with the same names and posted massive amounts of clickbait intended to direct people to third-party websites.
"Our decision to remove these pages was based on the behaviour of these actors – including using fake accounts and repeatedly posting spam – rather than on the type of content they were posting,"Facebook said in a statement.
It was not immediately clear how to contact RFA.O Estado reported that owners of the company did not respond to requests for comment.
Facebook said it had detected spammers increasingly using sensational political content across the political spectrum to build an audience and drive traffic to their websites.