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How to track a particular event at regular time intervals?

For instance tracking the Linkedin companies, jobs related to specific technology (cloud computing, big data, etc.). How can we do that?

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Do you mean fetching the content of specific website at regular time in order to retrieve something useful? –  Larry Mok May 25 '13 at 10:03
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I read the question as Larry did.

If available, fetch a RSS feed (or use a service's API) with e.g. PHP via a cron job. I use this technique to (among other things) fetch the number of likes from Facebook.

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