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 ...


4

The questions which are in different color are those ones, which have one of your watched tags. (This feature used to be called favorited tags, but it was later renamed.) From What do “watched tags” and “ignored tags” do? Questions with these tags become highlighted on the front page. Questions with new activity are shown on stackexchange.com/filters. In ...


4

There's a feature 'Filtered Questions' on stackexchange.com. Just go to https://stackexchange.com/filters/new and fill out the form: That works for email; if you're more into RSS feeds, there is a link at the bottom of the right sidebar of the [tag page]:


3

This is only partial answer, since I was unable to replicate the behavior you describe. (I do not see the "manage subscriptions" button. Possibly the reason that I do not get this button might be that I have set up a new filter subscription just now - to test what you are describing your question? Or perhaps this works only for tags which have been ...


3

Whenever you happen to have the privilege to see deleted questions or answers, they are given a reddish background to differentiate them from the rest.


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