for temporary quick coms between anons
You can use upside down text.
Algos don't appear to be able to see it because it is actually not upside down but is created by using asci text special characters and unicode special character sets.
example
ɯoɔ˙ʇxǝʇuʍopǝpᴉsdn
:oʇ ƃuᴉoƃ ʎq uᴉɐƃɐ dn ǝpᴉs ʇɥƃᴉɹ ʞɔɐq ʇᴉ uɹnʇ uɐɔ no⅄
˙┴XƎ┴ uʍop ǝpᴉsd∩ uᴉ ǝʇᴉɹʍ
:sɯɥʇᴉɹoƃlɐ ˥OOℲ oʇ ʎɐʍ ɹǝɥʇouɐ sᴉ sᴉɥ┴
translated as:
This is another way to FOOL algorithms:
write in Upside down TEXT.
You can turn it back right side up again by going to
upside down text DOT com