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Don't Facebook and Gmail already have 2B registered accounts and support 100 languages? Handling x5 is not a huge stretch of imagination. Whatever database, content storage, global syncing of data they have will likely also work for 10B users.

https://en.wikipedia.org/wiki/Facebook#User_growth "The 2 billion user mark was crossed in June 2017"

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But it seems that there is some growing problems with how FB or Twitter moderate content on their platform (And it's mainly for this reason that mastodon had some success in japan, where culture is different that in eastern countries and law allows some things that US/EU considers illegal).

On the other hand I don't see moderation made by a single enterprise scale to 10B users.

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