With a little cross referencing of third party "anonymized" metadata such as cellphone location, or facebook graph (works with other data set) it is very easy t

With a little cross referencing of third party "anonymized" metadata such as cellphone location, or facebook graph (works with other data set) it is very easy to uncover all the identities involved in this scenario with a high probability of success (>90%). You'd have to push preventive measures further than distributing outside of the same social circle if you are serious about this. One should also consider the legal aspect of this as there are places where faking your online identity is illegal.