With around 1.28 billion users logging into Facebook each month, it was inevitable that there'd be some duplication or falsifying of account information here and there, but the scale of it might well surprise some, with Facebook confirming that around 100 million accounts could be either duplicates or fakes.
In the company's latest quarterly report, it passed comment on the issue, saying:
There may be individuals who maintain one or more Facebook accounts in violation of our terms of service. We estimate, for example, that 'duplicate' accounts (an account that a user maintains in addition to his or her principal account) may have represented between approximately 4.3 percent and 7.9 percent of our worldwide MAUs (Monthly Active User) in 2013.
In 2013, for example, we estimate user-misclassified accounts may have represented between approximately 0.8 percent and 2.1 percent of our worldwide MAUs and undesirable accounts may have represented between approximately 0.4 percent and 1.2 percent of our worldwide MAUs.
Interestingly, the biggest culprits for creating these accounts seems to be developing and emerging nations like India and Turkey, and these accounts tend to be set up for the purpose of spamming, advertising or selling likes to companies.