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Possible Duplicate:
What do “favorite tags” and “ignored tags” do?

I think that it would be interesting if on Stack Overflow there was an option to save some tags as favorites. When someone posts a question related to this tag you should get a notification. It could be interesting if you are working in some technology that is not very popular.

What do you think?

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That's already done. If you subscribe to a topic, you can receive daily an email with all the new posts related to your favorite tag. Enter in stackexchange.com and take a look.

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