Sao Paulo: Facebook says it has removed 68 pages and 43 accounts associated with a Brazilian marketing group, Raposo Fernandes Associados (RFA), for violating the social media network's misrepresentation and spam policies.

A man logs in to Facebook in Brasilia, Brazil. Credit:AP

The newspaper O 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 number O 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.