I think the major difference is now everyone can get their tailor made brand of misinformation based on their own biases.
For example Cambridge Analytica had about 200 personality profiles that they used for targeted disinformation during the 2016 political campaign. So before people spreading misinformation had one or two stories to try and convince everyone. Now they know just about everything about you and can bombard you with misinformation until they find something that sticks.