Read [http://en.wikipedia.org/wiki/Ping_(blogging)] to understand ping service.
Ping services allow you to automatically notify blog directories and search engines that your blog has been updated. The bigger your ping list the higher the chances of receiving traffic from those sources
How to get the maximum out of this feature?
For WordPress users, Go to Setting > Writing > Update Services, Copy & Paste the ping services below and Save Changes.
Here’s a list that I currently use to inform the Search Engine that I have just post new update. If there is any service that is not included here please feel free to add a comment.
http://rpc.pingomatic.com/
http://ping.feedburner.com
http://rpc.blogged.my
http://www.holycowdude.com/rpc/ping/
http://zing.zingfast.com/
http://services.newsgator.com/ngws/xmlrpcping.aspx
http://www.blogpeople.net/servlet/weblogUpdates
http://rpc.technorati.com/rpc/ping
http://blogsearch.google.com/ping/RPC2
http://1470.net/api/ping
http://api.feedster.com/ping
http://api.feedster.com/ping.php
http://api.moreover.com/ping
http://api.moreover.com/RPC2
http://api.my.yahoo.com/RPC2
http://api.my.yahoo.com/rss/ping
http://bblog.com/ping.php
http://bitacoras.net/ping
http://ping.bitacoras.com
http://ping.bloggers.jp/rpc/
http://ping.blogmura.jp/rpc/
http://blogdb.jp/xmlrpc
http://blog.goo.ne.jp/XMLRPC
http://blogsearch.google.com/ping/RPC2
http://blogmatcher.com/u.php
http://bulkfeeds.net/rpc
http://coreblog.org/ping/
http://mod-pubsub.org/kn_apps/blogchatt
https://phobos.apple.com/WebObjects/MZFinance.woa/wa/pingPodcast
http://ping.amagle.com/
http://ping.blo.gs/
http://ping.cocolog-nifty.com/xmlrpc
http://ping.weblogs.se/
http://rcs.datashed.net/RPC2/
http://rpc.blogbuzzmachine.com/RPC2
http://rpc.blogrolling.com/pinger/
http://rpc.britblog.com/
http://pinger.blogflux.com/rpc/
http://ping.exblog.jp/xmlrpc
http://ping.feedburner.com
http://ping.myblog.jp
http://pingqueue.com/rpc/
http://ping.blogg.de/
http://ping.rootblog.com/rpc.php
http://ping.syndic8.com/xmlrpc.php
http://ping.weblogalot.com/rpc.php
http://rpc.icerocket.com:10080/
http://rpc.newsgator.com/
http://rpc.pingomatic.com/
http://rpc.tailrank.com/feedburner/RPC2
http://rpc.technorati.com/rpc/ping
http://rpc.weblogs.com/RPC2
http://rpc.wpkeys.com/
http://services.newsgator.com/ngws/xmlrpcping.aspx
http://signup.alerts.msn.com/alerts-PREP/submitPingExtended.doz
http://topicexchange.com/RPC2
http://trackback.bakeinu.jp/bakeping.php
http://www.a2b.cc/setloc/bp.a2b
http://www.bitacoles.net/ping.php
http://www.blogdigger.com/RPC2
http://www.blogoole.com/ping/
http://www.blogoon.net/ping/
http://www.blogpeople.net/servlet/weblogUpdates
http://www.blogroots.com/tb_populi.blog?id=1
http://www.blogshares.com/rpc.php
http://www.blogsnow.com/ping
http://www.blogstreet.com/xrbin/xmlrpc.cgi
http://www.holycowdude.com/rpc/ping/
http://www.lasermemory.com/lsrpc/
http://www.imblogs.net/ping/
http://www.mod-pubsub.org/kn_apps/blogchatter/ping.php
http://www.newsisfree.com/RPCCloud
http://www.newsisfree.com/xmlrpctest.php
http://www.popdex.com/addsite.php
http://www.snipsnap.org/RPC2
http://www.weblogues.com/RPC/
http://xmlrpc.blogg.de
http://xping.pubsub.com/ping/
http://www.zhuaxia.com/rpc/server.php
http://www.blogsdominicanos.com/ping/
http://www.xianguo.com/xmlrpc/ping.php
http://www.feedsky.com/api/RPC2
http://bblog.com/ping.php
http://blogbot.dk/io/xml-rpc.php
http://www.catapings.com/ping.php
http://effbot.org/rpc/ping.cgi
http://thingamablog.sourceforge.net/ping.php
http://ping.bitacoras.com
http://bitacoras.net/ping
http://www.catapings.com/ping.php
http://fgiasson.com/pings/ping.php
http://rpc.icerocket.com:10080/

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Please tell how we can do the same in blogger. Thanks