> Was your expectation that the tip should link to research determining the optimal distance from the camera to achieve good eye contact?

Yep, that would "back" the statement with research, otherwise it is conjecture. As mentioned, this particular statement is easy to dismiss given the wide variety of FoV on webcams - but other statements are equally unfounded.

To clarify - I like the site, and im sure it is useful to many, but its very misleading to state that it is backed by research when it isnt.