sticky notes in drupal

I have a site where i want to have a block where users can write notes into a textfield(like a post it note) and the content of the textfield should persist after user logout as well. Each user must have hiw own unique post it text area where only his notes shows up. how can this be achieved? i know theres a module called stickynotes but it isnt what i am looking as it is more complex. I only need a text area with a submit area (optionally using ajax to only type in text and not submitting). Can i just use a custom form in a block? and how can the content of this form be unique for each user?

Appreciate any help!