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Google Alerts

What it does: 

Sends you an email alert when Google finds a new result containing the search term you've supplied them.

When to use it: 

When you are monitoring a news story or to keep on top of an issue.

When not to use it: 

If you are not going to be checking your email regularly.

Strengths: 

Its fairly comprehensive and will let you know about content posted on the web that you otherwise wouldn't have noticed

Weaknesses: 

It won't alert you the moment that something has been posted.