Generally people are ok with Facebook doing it because they can opt out.
If you notice, the times people really get upset about companies tracking their personal information is if it's either not disclosed or it's done in a shady manner.
Also, capitalist societies tend to treat state actors differently than private corporations. It's much easier to choose a new corporation to interact with and the state tends to have a lot more personal/private data about you (which you're required to share with them).
Yeah ok but how many end-users are conscious enough of the situation to OPT-OUT of such an intrusive policy?
On the same vein as accepting every terms and conditions that comes your way, I think most people are severely uninformed about this. It's like how many people believe software engineering is "magic", they believe Facebook or the government will protect them with "magic". Hint: there is no magic.
> Yeah ok but how many end-users are conscious enough of the situation to OPT-OUT of such an intrusive policy?
Well, I meant opt-out as in "not use". Plenty of people don't use Facebook because of the privacy implications. And as another use mentioned, this is the reason that people are so upset about Facebook's shadow profiles, because it removed your ability to opt out of their tracking.
Personally I'm struggling to see the dividing line between the two entities. The NSA is a supplier of information for both US corporate interests, the state and the military industrial complex. Facebook is similar except it gets its funding from private equity and advertising revenue, whilst the NSA draws money from the tax payer.
We are OK with Facebook doing this and exploiting the data for monetary and market advantages.