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For questions about the favorite question feature or the favorite tags feature.

Favorite questions are marked by clicking the star below the question's score. It is searchable by using the infavorites:<user> query (where <user> could be mine to search your personal set of favorites). Favorite questions of any user are displayed in their profile in the favorites tab.

Favorite tags can be set in the prefs tab of your user page. Again, you can use intags:mine to restrict result of a search to your favorite tags.

For more see:

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