Some suspicions can be clarified. Especially ones with clear photos available.

As per online presence - we do not hire people that we have never seen. We're a remote and distributed team, thus rarely any hires get to have a walk-in interview, but we do always see the person being interviewed. I wouldn't waste hours looking at posts of a person I can clearly see is not my potential colleague. Having no online presence is fine, most of us don't at my current job. However, if it's there, it is going to be examined. It's way harder to get to know to understand someone as a person if you've never had had a face-to-face interaction, therefore having a video call is a must.