I want to be clear that I'm not here as a proponent of either party, but I can state for a fact that every voter data breach that I have found regarding U.S. politics, and every system of influence and so forth that I have looked at just recently in this past find, has been a Republican-based operation. I have not come across, to my knowledge, a Democratic system of selectively micro-targeting and influencing. Although it may exist, I have not come across it, so I can't speak to the Democratic side. I think it's clear that, yes, at the very least, the Republican side did, to great effect, utilize micro-targeting, compilations of disparate and wide-ranging databases, all-encompassing databases, from places you might not even expect, and, yes, brought it all together in a very effective way that sought out people who were influential and influenceable, and targeted those types of people with messaging to get a desired outcome.
On April 17th, 2018. See this statement in context.