https://www.bleepingcomputer.com/news/business/yahoo-messenger-now-joins-the-list-of-discarded-chat-programs/

Yahoo announced today that its Yahoo Messenger chat program is being discontinued on Juy 17th 2018. They are now directing users towards their Squirrel chat app that is currently in beta.

Like many of its counterparts such as AOL Instant Messenger, ICQ, and Microsoft Messenger, Yahoo Messenger was commonly used to talk to friends while at work, coordinate evening plans, or meet new people in chat rooms. With the rise of text messaging and mobile communication apps, early web based and desktop chat programs were pushed aside for the ease of using a mobile phone to communicate.