Twitter Secret Messages
From Just Solve the File Format Problem
Twitter Secret Messages (Steg Of The Dump) by Matthew Holloway is an online javascript steganography tool for text, and specifically Twitter/X
It works by replacing your letters with similar looking letters (Unicode homoglyphs).
It should work on Twitter and in emails. Facebook will probably corrupt the text however.
Your hidden message may only contain these characters: abcdefghijklmnopqrstuvwxyz123456789'0.:/\%-_?&; (6-bit charset) (no capital letters)