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What other candidates are there?

while WhatsApp is the largest I am aware of (it's one of the leading platforms Worldwide anyway), there are quite a few, sometimes in the form of Elixir:

- Discord

- Pinterest

- Spotify

- Klarna

- Riot games (the messaging service)

- PepsiCo (for their billion making e-commerce)

- Toyota (for the connected platform)

Facebook Messenger, if I remember correctly, was also originally authored in Erlang.

Discord also if I remember correctly?

Discord was written in Elixir! https://blog.discord.com/scaling-elixir-f9b8e1e7c29b

Does it mean it's technically also based on Erlang?

It runs on the Erlang BEAM virtual machine. But it’s very much it’s own language, and looks and feels very different to Erlang.

I would say the Elxir is based on Erlang about as much as Scala is based on Java.

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