Google Hacks 2Nd Edition [Electronic resources] نسخه متنی

Hack 59. Keep Tabs on Your Searches with Google Alerts

Receive alerts in your email Inbox or RSS
reader when something you're after makes its way
into the Google Web index or a Google News story .

There are two classes of search that one generally
runs in Google. One is of the sort that you generally run just the
once: you're trying to find information on some
topic, a phone number, or that URL you visited yesterday but have
since forgotten.

Then there's the search that you'd
run every day if you could. You're interested in a
particular subject matter and want to know the moment Google finds
and indexes something new on the topic.

There are a couple of services available that'll do
the trick: the official Google Alerts notifies you of any new web
pages or news stories matching your search criteria, while the
third-party service GoogleAlert watches only for new web pages but
sports a few extra features and delivery options not found in
Google's version.

Google's Web index does not consider a page "new" based on the date it was created. Instead, it considers a page new based on the date that it was found and indexed by the Googlebot. For more detail on the difference, see "daterange:" under the "Special Syntax" section in Chapter 1.

5.2.1. Google Alerts

Google Alerts (http://www.google.com/alerts),
Google's official alert offering, allows you to
monitor both Google's Web index and Google News
stories. To set up a Google Alert, visit the Google Alerts page. In
the Create a Google Alert form (shown in Figure 5-1), type in a search query and choose whether to
monitor news, the Web, or both.

You have a choice when it comes to how often you're
notified: as it happens, once a day, or once a week. Provide your
email address, click the Create Alert button, and
you'll receive a confirmation email message a few
moments later. Follow the link provided in the email
messagethus confirming that your email address is legitimate
and that it was you who requested the Google Alertand
you're all set.

Be careful of the update frequency option; monitoring Google News' 4,500 sources for even a slightly common word, phrase, or name and choosing to receive notification "as it happens" can fill your inbox with an avalanche of email.

Each alert that you receive includes your search query, the found
page's title, a snippet of content, and the URL (for
web index results) or story title, URL, description, and source (for
news stories). You can set up to 50 alerts per email address.

While all you need to sign up for Google Alerts is a valid email
address, there's also the option to sign into Google
for a more hands-on approach to managing your alerts. On the Google
Alerts page, click the "sign in to manage your
alerts" link.

You'll need to already have or sign up for a free
Google account. But membership has its privileges:

Signing in provides you with a nice overview of your active alerts.

If you don't sign in to manage your Google Alerts,
you can't edit the Google Alerts that you create.
All you can do is delete them and create new ones.

Google Alerts are delivered in HTML format as a default; by signing
in, you can switch to text and back again.

A Google account opens doors to other Google properties such as
Google Answers (http://answers.google.com), allows you to
create your own Google Groups (Section 4.15[Hack
#56], etc.

5.2.2. GoogleAlert

Before there were Google Alerts, there was GoogleAlert
(http://www.googlealert.com), a
third-party alert service built on the Google API [Chapter 9]. Being built on the API, it is kept to
only the Google Web index and can't monitor anything
like Google News or whatever else Google decides to have the official
Google Alerts cover in the near future.

However, GoogleAlert does offer a few features worth checking out.
Start by signing up for a trial account, which affords you up to
three queries.

Full GoogleAlert accounts aren't free; they range from $4.95 to $19.95 per month, affording you more searches with more extensive delivery options.

GoogleAlert's Advanced Search form, shown in Figure 5-2, is similar to Google's
Advanced Search page (http://www.google.com/advanced_search),
allowing you to build Boolean searches, search for exact phrases,
restrict your searches to a particular site or date range, specify
the file types that you're interested in, and
moreall without having to fiddle with special syntax.

You can receive your alerts by email, of course. But you can also
subscribe to them as a syndicated RSS feed, or have a page on your
weblog pinged by

TrackBack (http://www.movabletype.org/trackback/beginners)
notification any time something new comes up.

Monitoring Google's Web index allows me to find
search engines or directories of information that I might have missed
otherwise. I keep tabs on Google to find pages that
don't tend to appear out of thin air all that often:
those containing "online museum" or
"online reference service", for example.

I tend to use broader search queries when monitoring Google News.
While watching the Google Web index for "online
database" or "new search
engine" might net me thousands of
resultsand those long after the sites were actually
newonline news stories about new online databases and search
engines tend to crop up less frequently and provide a higher
signal-to-noise ratio.