I think the point is that they don&#x27;t have a definitive list of fake accounts, so the only thing they&#x27;ve been able to test are accounts they previously knew were fake, or new accounts it flagged that they were able to determine where fake.  That leaves out fake accounts that were newly flagged but weren&#x27;t able to be determined as fake, and fake accounts that are still entirely unknown.<p>At most you can say <i>some</i> fake Facebook accounts can be detected by when they post and the vocabulary used, which is what I think the top level comment was trying to note.