AOL Instant Messenger, the chat program that connected a generation to their classmates and crushes while guiding them through the early days of digital socializing, will shut down on Dec. 15, a decision its parent company announced in October.

Released in 1997, the program had largely faded into obscurity over the last decade, replaced by text messages, Google Chat, Facebook, Twitter, Instagram, Snapchat and on and on we go. But at its height, AIM, as it was known, served as the social center for teenagers and young adults, the scene of deeply resonant memories and the place where people learned how to interact online.

“AIM tapped into new digital technologies and ignited a cultural shift, but the way in which we communicate with each other has profoundly changed,” Michael Albers, vice president of communications product at Oath, the parent company of AOL, said in a statement on Friday.

The news of its official demise was met with cries of nostalgia, especially from those who were coming of age as AIM rose to prominence. For many people now in their 20s and 30s, learning to talk online coincided with learning to communicate like an adult, said Caroline Moss, 29, a writer and editor in New York who for years paid tribute to AIM with the parody Twitter account @YourAwayMessage.