"The same people who for 2 years have been saying that social media advertising is so effective that it got trump elected are now saying it is ineffective."

So does that mean you think that social media advertising is effective as people claim and Russian use of it got Trump elected?

Regardless of whether your "same people" is a straw man, the opposite of a set of inconsistent claims tends to also be inconsistent, so I'm not sure what you are trying to say here.