And I can write a similarly plausible narrative in the opposite direction. "Somebody who is starting to do yoga is definitely going to be affected by a yoga ma

And I can write a similarly plausible narrative in the opposite direction. "Somebody who is starting to do yoga is definitely going to be affected by a yoga mat ad. But political opinions involve deeply held personal convictions, cultural values, and moral intuitions, and may even be determined in large part by fixed personality traits. How could an ad possibly change all that?" That's why deciding on the conclusion you want and then writing a plausible narrative in support of it isn't good enough. A narrative can be made to support any conclusion. To decide which is true, you need actual evidence, which in the case of social media and politics is sorely lacking.