[Vervious]

This could be a cool domain for LinkedIn to move into —— allow reviews only from people who publicly list the company in their profile

[DANmode]

I think someone tried that; the issue lies with reviewers that really "spill the tea" (fellow kids, am I using that right?); specifically that Glassdoor can be legally compelled to unmask the reviewer.

[aww_dang]

Should be possible for 3rd parties if LinkedIn is still offering OAuth.