Not really. If they collected Facebook data, they would have to apply their bullshit algorithm to each individual. If you're correct that 16% of Facebook users are not Americans, then they would come up with something like 49% false-foreign results on the remaining 84%, which are Americans, or about 42%. That means their actual percentage of supposed foreigners in Facebook would be something like 58%, which casts a net over many millions of American citizens. And *that* is not only "technically" legal, under the current law it would be "fully legal", and legally defensible. But fucking retarded. They've gone too far.
This is one step away from becoming a watergate like scenario. And surely in the future many watergate like scenarios!
For God's sake, stop researching for a while and begin to think!