Tricky question. I was working on perf, so I could avoid the tricky philosophical / data science questions like that. FB did say in 2012 that they believe 8.7%

Tricky question. I was working on perf, so I could avoid the tricky philosophical / data science questions like that. FB did say in 2012 that they believe 8.7% of accounts were dupes or fakes. I can't say what the number is now, nor comment on how that relates to DAU accounting, but that's a good rough upper bound. Further, deponent sayeth not.