Karen Kilgariff and Georgia Hardstark may advise their listeners to not talk to strangers, but in their case, doing so proved transformative. The duo bonded over a shared love of true crime at a mutual friend’s Halloween party and decided to make a podcast on a whim. The first episode of My Favorite Murder, recorded in Hardstark’s rental apartment for an audience of one (her late cross-eyed Siamese, Elvis), dropped in January 2016. But their weekly exchanges — the format finds each sharing mostly macabre stories, with a comedic slant that’s rare in the genre — would soon surpass 30 million monthly downloads. It’s since spawned a network (Exactly Right Media, with 16 current original titles and counting), sold-out tours, a book and, on deck, an HBO miniseries. They inked a rich deal with Wondery, which they exited before later signing with iHeartMedia. And now that video is all but compulsory, their podcast will stream on Netflix. A comedy writer and cult stand-up (Kilgariff) and a journeywoman TV personality once best known for creating the …