A Mysterious Group Just Installed 50 Swings Around San Francisco. As the anonymous group writes in their Instagram bio, their goal was to turn San Francisco into a "pop-up playground." The swings were hung in secret over a weekend in locations like Lombard Street, the Embarcadero, and the Tenderloin district. With no indication of where the swings came from besides the hashtag #SwingBombSF drawn on the bottom of each swing, they seem to be there to invite the young and young-at-heart to stop whatever they're doing, sit a while, and allow themselves to have fun.