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You can find links to some basic info on favorites here, specifically this post is rather detailed: How do favorite questions work? This feature request has been posted on main meta a few years ago: Add a page explaining the favorites feature to the Help Center. Existence of this feature request suggests that you are probably not the only person who ...


8

You went to "favorites" tab. Now (not necessary, but just to see what post was last active) select "Activity" and then click the date (sssssh, it is the secret, for this reason the timestamp looks unclickable ;) ). If you are taken to the question, then something was happened to the question. Go to the revisions (if no "edited X time ago" displayed, ...


5

The number of followers is shown in the tooltip which is displayed when you hover over a tag. As already explained in comments, this is number of users who have the tag among their favorite tags plus number of users who have email subscription to new question in the tag. For more details see: What is meant by tag follower versus the “x number” that appears ...


1

I first check when the question was last edited. Then I check the latest answers -- at the beginning of answers there are three tabs: |Active| |Oldest| |Votes|. Selecting |Active| puts the latest on top.


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