Nice article, however, I do not agree with your argument that this is inappropriate. I have been a vocal Trump critic, but this to me seems like just another procedural step to seeing if incoming visitors social media accounts are linked to dangerous activity.
Also, Social Media accounts are a luxury, an extra. If someone does not want to deal with that while going through the visa process of the USA, they can simply abstain from social media. There is nothing about Social Media that requires that we participate in it. Overall, this really just doesn’t seem like an important issue.