Brazil has the highest active reach of Internet consumers using the social network from home/work computers. Some 38.1 million Brazilians visited Facebook during March 2012, equivalent to 76.7 percent of all people who were active online that month from home and work computers in the market
Facebook by the numbers: 845 million users sharing 100 billion friendships - The Sociable - 1 views
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Facebook’s market penetration in the United States is at saturation point, reaching 161 million monthly users and representing a 16% increase on the previous year. Facebook has highlighted Brazil and India as two countries representing a “key source of growth”. It currently has 37 million and 46 million monthly active users in Brazil and India respectively, representing an increase of 268% and 132% on the previous year.