I mean that if I think I am "master" in some topic or tag (iOS address book, localization etc.), I wish to get an alert when a user posted a question tagged with a specific tag. Is there a way?
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You can do that by subscribing to the tags you are interested in, thus getting email alerts – you can subscribe from the tag mouseover.
However, if you're familiar with RSS, I recommend to use the builtin RSS feeds, since you can do that not only for single tags, but also for some boolean combinations of them: see this blog.SO post.