If you are interesting in following any questions on, say (for instance), 'authentication', you can just open a new tab in your browser.
http://stackoverflow.com/questions/tagged/authentication (more than 800 questions)
That means opening 3 or 4 tabs (just for one topic).
If you follow actively 2 or 3 tags (in separate tabs, without using 'or' operator, in order to avoid having sorting through each list in order to not miss a question for a particular tag), and if those tags are relevant for 2 or more SO-family sites... you end up with a lot of opened tabs.
1/ Would it be possible, when asking for questions tagged xxx, to be able to requests results from other SO-family sites? For example:
(and the following is by no mean a 'solution', just a proposition to illustrate how to achieve the end-result)
http://stackoverflow.com/questions/tagged/authentication?sites=sf and su
would display questions from SO and SF and SU, in my current SO page.
(Hopefully, color-scheme associated with each questions, or an dedicated icon, could help pinpoint which site they come from, but actually, when you are interested in a topic, you do not really care at first where it has been published)
2/ If that is not possible (too complex, or too confusing for the user), what would be your suggestion for that kind of "question monitoring on multiple sites"? (except opening a gazillion of tabs ;) )
If that issue makes sense, I will add the 'feature-request' tag on it.
I am just looking for some feedbacks first (since there could very well be a much simpler solution to this).
I did some tests with Google:
- the results does not appear to follow a "most recent" order (which is what you want if you want to actively participate in the tags you are following)
- Google does not appear to support multiple "Search within a specific website" (site:).
Perhaps the "Google Custom Search" API can help.
Regarding RSS, I am not sure the "refresh" rate of those feeds is quick enough for question monitoring (when you want to see at spot if a new question exists): a refresh in a browser directly query SO, but a refresh in an RSS aggregators would only display what has been published, or worse, what has been cached by the aggregator.