Categorization: yes, we do think to give user the opportunity to tag its post/thank you message. We're also planning to create an 'auto-tagging' mechanism based

Categorization: yes, we do think to give user the opportunity to tag its post/thank you message. We're also planning to create an 'auto-tagging' mechanism based on the type of page that our 'thank-you' button is placed. Ranking: Yes, we will provide "top" lists for the categories. But the ranking algorithm may include other variables than the "# of thanks" to make it more accurate.