Anonymous to my friends and no one else?

I guess I don't get the use case, as I would generally think anonymity from people I already am acquainted with would be the least useful (to me).

It really seems like there is an entire class of applications that have risen to answer problems that exist solely because of Facebook's dominance and policies (ie: data collection/retention policies and insistence on identity).

Because this is the default case, we need another word for the hypothetical "anonymous to all, including law enforcement and intelligence agencies". perfect anonymity?

Contingently Anonymous.

'pseudonymous' I believe.

I would call it curtain anonymous.

Anonymity theatre?