I think that intent matters. Misinformation is dissemination of information that may be misleading but wasn't necessarily intended to be misleading. Perhaps the author themselves lacked the pertinent data (or really believed what they were saying). That is distinct from disinformation, which would be intentionally deceptive. Regarding material omissions, it would only be misinformation if the person disseminating the information did so unknowingly. And hypothetically it would only take one person to inform the author of the material omission and naturally further publications with the same material omission then count as disinformation.
I think the hair-splitting is due to the fact that majority of memes associated with one side or the other are not outright false, but are conditioning people to a particular pre-determined conclusion. In other words, if you're interested in battling mis/dis-information, you have to recognize the over-arching agenda and attack that, not rebut/censor every meme and thought internet randos and robots see fit to post.
I think the hair-splitting is due to the fact that majority of memes associated with one side or the other are not outright false, but are conditioning people to a particular pre-determined conclusion. In other words, if you're interested in battling mis/dis-information, you have to recognize the over-arching agenda and attack that, not rebut/censor every meme and thought internet randos and robots see fit to post.