I seriously haven't used it in a decade but there's this "but what if I ever have to change jobs and it's not up to date" which isn't active FOMO it's ... like what, first degree derivation FOMO? FOMO's FOMO rate of change?
God that's disgusting.
If you really want to hate it even more than you already do, I'll tell you that LinkedIn's financials are reported under Microsoft's Productivity and Business Processes segment. Which is grade-A vomit inducing in my book.