I agree that's the real challenge, but it seems pretty doable. For example, display added text in italics and deleted text in strikethrough. (Like some legisla

I agree that's the real challenge, but it seems pretty doable. For example, display added text in italics and deleted text in strikethrough. (Like some legislatures do: https://www.ncsl.org/legislators-staff/legislative-staff/research-editorial-legal-and-committee-staff/types-of-markup-used-in-bills637032129.aspx https://www.ncsl.org/legislators-staff/legislative-staff/res...) And show this view by default, so that users must read through the old text when looking at the new text. Things get more complicated with multiple edits to a single tweet. You could possibly extend the approach, or you could allow only one edit.