There are already forms that ask for social media info, e.g. student visa applications. Surely some of the applicants just don't have any social media profiles. Maybe some of them are reading this. I'm curious about their experiences.
If you truly don't have social media, their search won't show any hits, and there isn't much you can do about it. Just make sure you're actually answering the question truthfully.
Did we really forgot about what happened back in 2013 so quickly? Did people assume all these agencies suddenly stopped doing what they've been doing for decades? Nothing you do on the internet with regular network connections are hidden to these entities, don't live falsely under the impression that you can.
The anime avi posters will have to level up their OPSEC