ICQ (1996)

ICQ was one of the first widely adopted instant messaging services, revolutionizing how people connected online. Launched in 1996, it quickly became a staple for internet users, especially with its unique UIN (Unique Identification Number) system that allowed users to find and connect with each other. The iconic 'uh-oh!' sound it made upon receiving a message is instantly recognizable and deeply nostalgic for anyone who used the internet in the late 90s and early 2000s. ICQ played a significant role in shaping online communication, paving the way for modern messaging apps and social networks. It was more than just a messaging app; it was a digital community hub where friendships were forged, and relationships blossomed.