I am not worried if Russians hacked USA or not. I am quite certain they did (try to affect the outcome). This time it most likely did not make any difference, but next time (in my country)? Now they know what to do in grander scale:
1. fake news - it is well known people believe these
2. one sided "true" (i.e. slightly colored version of truth) stories leaked - again certainly will be believed.
How can we counter that? There is pretty much nothing we can do, as we can see in this thread, nobody believes news that are contrary to their (old) beliefs. We can try "fact checking sites", but then, nobody gives a shit about truth (as can be seen from this thread - it is hard for me to believe FBI and White House are lying just for fun.
So what should be done so that other government cannot hack (to get dirt from candidates), hack (create fake "news" sites), hack (spread rumours an untruths) and hack (pay locals to do same)? Ignore until provable evidence is around (which, due to Internet, is extremely slown and hard)?