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Tweetbeep.com is A great productivity tool which emails Tweet Digests alerts periodically based on a search term. This means you can track tweets based on vertical markets or specific interest areas easily.

You can choose between hourly and daily alerts and have up to four with a free account.

The service is very similar to Google Alerts which provides the same facility for Google Search.

Tweetbeep.com - Google Alerts style Service for for Twitter