Look later in the thread. The estimate is that Obama took data from about 190 million profiles, about 189 million of which gave his campaign no explicit access to their data, and about half of whom would have explicitly objected to Obama’s use of their data had they known about it.

You might think “well that’s egregious, but the rules at the time allowed it”. Unfortunately, even that isn’t true. Obama’s app did not play by the rules. The Facebook developer platform rules at the time stated, essentially, that you could not use the data you gained access to through your apps for any purpose outside of the operation of your apps. In other words, you weren’t allowed to create an app that claims it just sends a message to your friends about how wonderful Obama is, and then take the friend data you gain access to through that app and use it for the targeting of political advertising and/or campaign strategy, which is by all accounts precisely what they did. So they broke the same rules that Kogan did, just on a much larger scale, and with Facebook’s tacit approval.