Facebook has a lot to answer for. They gave Cambridge Analytica access to their users who under false pretenses by CA to Facebook users downloaded an ap that gave CA access to their private information, also who they liked and followed. The users were never asked for permission to gather this information in violation of Facebook policies.
CA stole data from 50 million Facebook users to run through algorithms and profile each and every one. Cambridge Analytica then gave that information to their benefactors, Steve Bannon and Robert Mercer, a billionaire hedge fund manager, whose political action groups sent targeted messages to manipulate and help direct voters to support the Trump campaign. If somebody is neurotic, they sent messages to elevate fear. If somebody was racist, they sent messages using that information and so forth.
Nobody knows at this time what all Mercer or Bannon has done with or done to secure this information.
CA also traced people's associations. Not only who they were talking to but who they liked and CA went after information on those people too.
Lukoil, a Russian oil firm tightly associated with Putin also talked with Cambridge Analytica about voter information.
Facebook has a privacy agreement with it's users that was breached. There are already legal claims made against Facebook to find out what information was stolen from them. Of course, your inane question can't be answered right now, because very similar to your cries that the Russian investigation "is a distraction" the investigation hasn't yet finished.
I would hope that somebody in CA is under investigation for breaking into Facebook's accounts. Mueller's investigative team has already ordered Cambridge Associates to turn over to them all files they have related to the Trump campaign.
Too funny you'd ask what the end point is at the very beginning. Distraction, right? Is this where you defend Putin and Russia?
https://www.npr.org/2018/03/18/594671296/report-cambridge-analytica-harvested-private-information