MOST OF MY FACEBOOK FRIENDS THINK THIS IS AWESOME, NOT TRAGIC: The Shut-In Economy.

Angel the concierge stands behind a lobby desk at a luxe apartment building in downtown San Francisco, and describes the residents of this imperial, 37-story tower. “Ubers, Squares, a few Twitters,” she says. “A lot of work-from-homers.”

And by late afternoon on a Tuesday, they’re striding into the lobby at a just-get-me-home-goddammit clip, some with laptop bags slung over their shoulders, others carrying swank leather satchels. At the same time a second, temporary population streams into the building: the app-based meal delivery people hoisting thermal carrier bags and sacks. Green means Sprig. A huge M means Munchery. Down in the basement, Amazon Prime delivery people check in packages with the porter. The Instacart groceries are plunked straight into a walk-in fridge. . . .

Back in the elevator in the 37-story tower, the messengers do talk, one tells me. They end up asking each other which apps they work for: Postmates. Seamless. EAT24. GrubHub. Safeway.com. A woman hauling two Whole Foods sacks reads the concierge an apartment number off her smartphone, along with the resident’s directions: “Please deliver to my door.”

Hey, it’s one of the few sources of jobs in California’s moribund economy. Quick, let’s shut this one down too!