How many unique tweets are possible?

How many unique tweets are possible?

Follow the link to see a brilliant way to analyze this! Information Theory is wonderful 🙂

At first thought, seems like:

Tweets are 140 characters long. There are 26 letters in English—27 if you include spaces. Using that alphabet, there are 27^140 ≈ 10^200 possible strings.

But the right answer is closer to

the bottom line is that it suggests there are on the order of about 2^(140×1.1) ≈ 2×10^46 meaningfully different English tweets, rather than 10^200

XKCDs what-if blog posts are a great read, I await a new post each week.

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