The biggest difference between the two campaigns was that in the 2012 campaign these APIs were available, while in 2013-2015, Facebook shut down the friends API, with a few exceptions. The only reason CA got access to it was that it was for "research purposes".
In other words, CA lied about the intended use. From a data collection standpoint, it was the same thing Obama's campaign did in 2012 for get out the vote efforts.
In other words, CA lied about the intended use. From a data collection standpoint, it was the same thing Obama's campaign did in 2012 for get out the vote efforts.