I don't think they did anything of the sort during the elections. Only now that the brazilian government is trying to pass laws that could very well drive them out of the country did they make their own position clear.
This has also happened to WhatsApp by the way. Judges blocked WhatsApp nation wide for days because it failed to provide plain text user messages in a criminal investigation. Zuckerberg posted his opinion about it on Facebook.
> Its users are the ones doing the influencing, not the company itself.
I don't think those can both be true.
Mind you, I'm not on Brazil's side here. I'm just saying that your two statements seem contradictory.