There are a couple of things on this.
“Fake accounts” is the term we use at Facebook. Fake accounts are prohibited on Facebook. They are a violation of our community standards, and we do remove them. We've removed, in the last quarter, well over one billion fake accounts.
We believe we are finding more than 99% of fake accounts before anybody interacts with them. This is absolutely something we want to work very hard at and get even better at.
I think your question is with respect to law enforcement. Where there are law enforcement entities that have the lawful authority to request information about particular users and they are exercising that lawful authority, it is absolutely the case that we will comply with and work with them.