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I've posted a quote from this article below that details how Obama's 2012 campaign did practically the same thing Cambridge Analytica is being accused of. [1]
So data mining Facebook has being going on for a while, except that the MSM and Silicon Valley supported it because it favored Obama.
[1] http://www.nytimes.com/2013/06/23/magazine/the-obama-campaig...
Obama did the same thing in 2012.
"The campaign didn’t go into much detail, at the time, about exactly how it used Facebook. But St. Clair put it in fairly stark terms when I talked to him at A.M.G.’s temporary offices in Williamsburg, Brooklyn, in April. They started with a list that grew to a million people who had signed into the campaign Web site through Facebook. When people opted to do so, they were met with a prompt asking to grant the campaign permission to scan their Facebook friends lists, their photos and other personal information. In another prompt, the campaign asked for access to the users’ Facebook news feeds, which 25 percent declined, St. Clair said.
Once permission was granted, the campaign had access to millions of names and faces they could match against their lists of persuadable voters, potential donors, unregistered voters and so on. “It would take us 5 to 10 seconds to get a friends list and match it against the voter list,” St. Clair said. They found matches about 50 percent of the time, he said. But the campaign’s ultimate goal was to deputize the closest Obama-supporting friends of voters who were wavering in their affections for the president. “We would grab the top 50 you were most active with and then crawl their wall” to figure out who were most likely to be their real-life friends, not just casual Facebook acquaintances. St. Clair, a former high-school marching-band member who now wears a leather Diesel jacket, explained: “We asked to see photos but really we were looking for who were tagged in photos with you, which was a really great way to dredge up old college friends — and ex-girlfriends,” he said." [1]
[1] http://www.nytimes.com/2013/06/23/magazine/the-obama-campaig...