Facebook Reaches 100 Million Monthly Active Users in the United States

Facebook announced last week that it had crossed the 350 million worldwide active user milestone. If Facebook were a country, it would now have the third largest population in the world. Today, Facebook just crossed the 100 million active user mark in the United States — actually, more like 100.5 million, according to data we’re tracking at Inside Facebook Gold, our data and research service covering Facebook growth worldwide. That’s nearly one third of the total US population logging into Facebook each month.