2019, iHeartRadio introduces its own "Sonic Logo", a five-note sounder with two heartbeats at the end. It includes specific variations (including vocal versions) for different formats or productions. In early 2020, iHeart fired "dozens" (estimated by one newspaper as "hundreds ... across its more than 850 radio stations") of its then 12,500 employees at a time when the company, bankrupt, was viewed as being considered for purchase by Liberty Media. iHeart described these layoffs as being technology-driven. On April 23, 2020, the iHeartRadio app was launched in association with Uno Radio Group, which owns the NotiUno, Salsoul, Fidelity and Hot 102 brands in Puerto Rico. On December 1, 2021, iHeartRadio signed a deal with Roku to bring a dozen of their live radio stations to The Roku Channel's live TV lineup. The ad-supported stations (which include iHeartCountry, Alt Radio, The Beat, Classic Rock, Hit Nation, Latino Hits, iHeart80s, and iHeart90s as well as select holiday-themed stations when available) was to feature imagery to complement and enhance the audio experience, similar in fashion to Music Choice on digital cable and satellite TV. Acquisitions In September 2018, iHeartMedia announced it would acquire Stuff Media, LLC, a U.S. for-profit publisher of podcast content listeners, which included the HowStuffWorks podcasting business division as well as its slate of premium podcast content, for $55 million. With Stuff Media and iHeartMedia having had around 5.3 million and 5.6 million monthly listeners beforehand, respectively (according to Podtrac), the acquisition increased iHeart's lead as largest commercial podcast publisher, although it was still trailing behind NPR. As of 2022, iHeartRadio is now the leading podcast publisher on Podtrac, with over 400 million downloads each month. In November 2018, iHeart also bought Jelli. In October 2020, it was announced that the company would acquire Voxnest, the parent company of Spreaker, a podcast hosting company. iHeart has since also bought Triton Digital from Scripps. Investments In February 2022, iHeartMedia invested in Sounder. Availability and supported devices iHeartRadio is available in Australia, Canada, the United States, Puerto Rico, Mexico and New Zealand. It is available across 250 device platforms including online, and via automobiles, gaming consoles, home audio, mobile smartphones and tablets, TVs, and WatchOS. Functionality and rating system Listeners can hear live radio stations, personalized music stations, create playlists, listen to podcasts and more. The iHeartRadio player has a Like/Dislike (Thumbs Up/Thumbs Down) rating tool used on songs playing on live