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Welcome to Tableau and the Community forum. As far as I know, you cannot have users create comments or annotations in Tableau.
Having said that, I remember seeing something in Tableau by Ryan Robitaille and check this thread with some options;
I have also seen a way to capture survey data using webapi and storing in GoogleDocs and let me ping our zen master Ramon Martinez if he knows about that.
Hope this helps and you have come to the right place
Thanks KK. This certainly gives me options to think about.