Old aim chat
Chat rooms, in which multiple people could IM with each other, were another popular AOL feature. Messenger in 1998, originally under the name Yahoo! In 2009, the company announced more than 330 million active users every month.Multi-user operating systems such as the Compatible Time-Sharing System (CTSS), which was created at Massachusetts Institute of Technology (MIT)'s Computation Center in 1961, allowed up to 30 users to log in at the same time and send messages to each other.The system, which is perhaps closer to what we now think of as email, had hundreds of registered users from MIT and other New England colleges by 1965.From ICQ to AIM, Google Chat to Facebook Chat, Internet users have been able to send messages to each other instantaneously for years. Instant messaging has been an evolving idea for a long time, so it's somewhat difficult to pinpoint its origin.