The single biggest everyday-use thing I miss with PHP is keyword arguments. With PHP the only real equivalent is passing an array of arguments and then checking if each possible key exists, and that's just way clunkier.
The most provable thing is that if you ever make the mistake of granting them access to your email account, everyone on your contact list can expect multiple spam messages FROM YOU begging them to join LinkedIn. It's the kind of thing only the shadiest of shady Facebook apps employ.
Harvesting of contact information even without permitted access is less clear cut but there's widespread concern due to the large number of questionable coincidences.
Yep, it's a social status dogwhistle, just like requiring college degrees for jobs where it is in no way relevant.
There's also a significant racial component to it. It's not a coincidence that top power-broking universities have moved sharply away from objective towards subjective metrics and increased the percentage of legacy admissions at the same time that increased access for minorities has been sought.
I love these "economists" waffling on about reasons why young people aren't spending money on X like their parents used to, that have nothing to do with oh I don't know "stagnant wages", "crippling student debt", or "30% unemployment".
"It's All About The Material Conditions, Stupid" -- Karl R.R. Marx, A Song of Capital and Ice