It's impossible to believe, but we once lived in a world without Twitter. Eight years ago, that is.
The social media service celebrates a birthday today, and a look at various celebrities' first-ever Tweets prove how far we've come.
But in honor of Twitter turning the calendar on another year of life, we flash back below to 2006 and relive the initial online messages sent by Cyrus, Bieber, Lady Gaga and many other superstars.
It seems like only yesterday, right? Okay, maybe not...