I'd go with any result on Google for "collaborative text editor". setup a public pad, write your text, delete it. and you're done! it's likely they don't even save history, but who knows. free, anonymous, literally instant messaging.
I'd go with any result on Google for "collaborative text editor". setup a public pad, write your text, delete it. and you're done! it's likely they don't even save history, but who knows. free, anonymous, literally instant messaging.