Do you really believe that Facebook/WhatsApp don't have the data ? Please we are in 2016, data is everything! Don't you think they sell or use our data for an infinite kind of applications like send ads ? Analysing our personal data like WhatsApp and Facebook they can have so minimum details about us and classify in really minimum groups of "publicity". The mankind never in history had so mach data and ways(powerful computers) to compute it like today. it is not a stupid conspiracy theory, Google does read our email to sell ads and it is in the ToS. The question is, just because it isn't in the ToS it doesn't exist ? And nobody can investigate it ?
Is really hard to separe what should be known and what should not. Like is total absolute right for many reasons as repression write about an government in anonymous. But it is right spread a video from a naked girl from work who got drunk and slept with you ? That's happen EVERY SINGLE DAY here in Brazil, guys take advantage from girls and screw up they life. Would be quick easy track the first person who did share the video, and this morons in most of the times don't think in use a proxy, Tor or something like. Because if they could think, they would never destroy a person's life doing such stupidness in exception psychopaths.
Just to clarify stupid arguments. The federal police was asking information like ip address from organised crime pages, they use Facebook as other social network pages(In this case actually we are talking about Whatsapp). Don't have ANYTHING TO DO WITH SPY CITIZENS. Like PCC(https://en.wikipedia.org/wiki/Primeiro_Comando_da_Capital) has an official facebook page. There is many people in Brazil who stole cellphones, kill people and post on Facebook(Yeh, I know is ridiculous dumb, but people does). Definitely the IP address will help the cops. Please stop to talk about stupid spy conspiracy without understand the "why". They arrested Facebook's VP because they don't know what to do anymore, because Facebook always deny the justice requests. Oh, if you think that they are protecting your data, you are just dumb as a stone, they are just protecting them self.
(Sorry for my poor english, it isn't my first or second language.)