To build a folly is essentially to do something a second time, something at an inopportune moment. That something is always the memory of something forgotten, about which we can paradoxically say "There it is again."
Follies were misunderstood, purposeless constructions. They were often only small, extravagant gestures in a garden, easily whisking off the imagination to distant lands, a sort of time capsule built to awaken the memory and induce surprise in passers-by. They marked locations, organized secondary paths in a park, or simply predicted the arrival of better times—a demarcation, a sacred spot, a mysterious trail, a hill whose tragic rocky nature begged for a tower, a party, or the arrival of summer.
“It is demonstrably true that things cannot be other than as they are. For, everything having been made for a purpose, everything is necessarily for the best purpose.” — Professor Pangloss
When we use non-spatial social apps, we often understand that another's cognitive presence is there, but we can't feel the more human presence we're wired to need. When we're not social distancing, we fulfill this need elsewhere, outside of software. We meet for coffee. We go on a walk. We play a game, or show a friend something funny on our phone and watch them laugh. We have infinite options at our disposal for relating to others. Though the lack of these same options inside the software we use is sometimes inconvenient, we can usually get over it.
But things are different right now. We're constrained to rely almost exclusively on software for social interaction. What are usually minor inconveniences in our existing applications are now the main factor preventing us from fulfilling our social needs.