Answer:
It's impossible to determine exactly how many people have Facebook accounts, as there are many people who create multiple alternate accounts.
However, there are over 400 million accounts, 110 million of which were created in the United States as of 6/13/2010.
i once saw something on the news that said over 20000-200000 underage people join Facebook every day so what about the correctly aged people? probably a little bit less
People don't know how many people there are on a face book account there could be few there could be hundreds there could be thousands or maybe million's!!!!!!!!!!!! Some people might know though.