Look at the comments in just about any YouTube video or internet article having anything to do with Russia or the American Military, and you can see these trolls at work.
The good thing is they aren't very good at it, and they're obvious as hell.
The ones running the twitter operation seem to be a bit more sophisticated, though.
ETA: China does the same thing, though I haven't seen as many of their shills ever since word got out about it.