I just googled a little bit (won't share the links because they are easy to find and check, and I am on mobile, at work). Orkut had ~29 million users by the ti

I just googled a little bit (won't share the links because they are easy to find and check, and I am on mobile, at work). Orkut had ~29 million users by the time it was passed by Facebook in number of users in Brazil. This was about ~65% of internet users in Brazil. Today Facebook has ~75 million users in Brazil, which is about 53% of internet users in Brazil today. Of course, it all depends on how you define "monopoly" here. But with the definitions: "% of users that use any social network" or "% of users that use the internet" , Orkut had as much a monopoly as Facebook today. If the definition is "% of users from the whole population" that probably Facebook has more today.