1

when sombody edits a question, he always leaves like "added 70 characters in body" in the explenation.

I don't think everybody counts the amount of characters they add.

how do they know how many characters have been added? Is it witten somewhere or do they just count?

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8

That is the default edit message when you don't provide one. (2k rep users and post owners can skip that field.)

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