Privnote

The PR is impressive - Privnote says they don't collect any personal information. You enter your message and click 'Post It.' Privnote then gives you a link to the message for you to share with someone. Once the message is read, it is erased from Privnote's servers - it is, essentially, "gone". If you like, you can receive notification of when your message has been read.

Here's my question, as a non-techie person: how gone is it, really? https://privnote.com/about