[jianshen]

Did you ever use AIM, ICQ, MSN, Y! Messenger? I'm quite certain that in a decade, there will be another batch of dominant messengers "reinventing the wheel" (IG & TikTok I'm looking at you). Real-time Communication is just such a crucial part of people's lives that people will never stop working on it, even if it feels like it's been solved.

[WhyNotHugo]

I get chat these things evolve, and change over time.

My fascination is that we've very equivalent things (eg: WhatsApp and Telegram aren't that far apart), duplicated even in the same generation.

I did use ICQ, MSN, IRC then WhatsApp, but they didn't belong to the same periods.