Which came first, email or TikTok?

email came first, by 45 years. Ray Tomlinson sent the first message between two computers and chose the @ sign.

Side by side

email

Messages had been left for other users of the same machine since the mid-1960s. What Tomlinson did in 1971 was send one between two different computers on ARPANET, and pick @ to separate the user from the host because it was the only preposition on the keyboard that could not appear in a name. He did not record the first message and later said it was probably "QWERTYUIOP" or similar. Email is eighteen years older than the Web.

TikTok

The app launched in China as Douyin in September 2016 and internationally as TikTok in 2017. What made it global was the 2018 acquisition and merger of Musical.ly, a lip-sync app that had launched in 2014 and already had a large Western user base — so part of TikTok is two years older than TikTok. Douyin and TikTok remain separate apps on separate infrastructure.