Pinging will alert different search engines that your blog has updated.
So the crawlers will come and index your new blog post.They crawl and index your site and your blog gets more visitors.

Ping-O-Matic blog ping service announce different search engines that your blog has updated.

The blog search engines that Ping-O-Matic use are:
Weblogs.com
Blo.gs
Technorati
Feed Burner
Syndic8
NewsGator
Feedster
My Yahoo!
PubSub.com
Blogdigger
BlogRolling
BlogStreet
Moreover
Weblogalot
Icerocket
News Is Free
Topic Exchange

specialized ones:
Audio.Weblogs
RubHub
GeoURL
A2B GeoLocation
BlogShares

To use Ping-O-Matic go to http://pingomatic.com. 

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