You can network without an app or a permanent digital record.
We threw epic parties for ~80 to 100 people every month for five years back in the student days, in a massive cheap rental house scheduled (along with a 120 others) for demolition for road widening for a major North-South throughway.
It was high on a hill (now a cutting), colonial gilded age "beach house" with a view to the ocean ... and I suspect a great many of the people that passed through can happily live without a record of their debauchery now some decades have passed.
Networking-wise, it was a trove, numerous marriages and business partnerships launched, a few dashed on the rocks, still remembered fondly as a point of reference by a crowd now scattered across the globe.
