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If we want to prevent future Russian manipulations of the American democratic process, we have to know what they did.

So it is frustrating that the American tech companies Russia used as part of their strategy are not being more forthcoming about how Russia used their platforms.

Everything we know so far is from what journalists have been able to figure out.

Watch Rachel Maddow run through the growing list of what we’ve learned so far: http://on.msnbc.com/2yWWw7l