ICQ

ICQ ("I Seek You") was an instant messaging service launched in 1996 by Israeli company Mirabilis that pioneered many features now standard in digital communication, including user registration numbers, offline messaging, file transfers, and chat rooms. Each user received a unique ICQ number that served as their permanent identifier, with lower numbers carrying social status as indicators of early adoption.

Why ICQ Matters

ICQ demonstrated the global demand for real-time internet communication and established technical standards for instant messaging that influenced all subsequent platforms. The service's ICQ numbers became the first form of digital identity verification, presaging modern username systems and account authentication methods used across social media and business platforms.