A website called A.nnotate is an online web service for sharing notes on documents and web pages using a web browser. You can annotate the document, get replies to your annotation, keep history of annotations and share the annotations with your friends/family/collegues.
A.nnotate can also be a great source for getting feedback for your website. You can put A.nnonate button on your site which will take a snapshot of your website and let your users annotate or supply feedback for your site.
Give it a try A.nnotate.com
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