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.