When you publish a new post, there is a “ping service” that will send a notification out to other services, notifying them of your new post. Adding ping services can help you gain exposure to your articles. You can see the list of ping services you’re using in your WordPress Dashboard, under Settings -> Writing at the bottom. By default, WordPress uses one service :
There are many other ping services you can use; there’s a decent list on the official WordPress.org Updates Services page. As of writing this post, the list is:
http://rpc.pingomatic.com http://rpc.twingly.com http://api.feedster.com/ping http://api.moreover.com/RPC2 http://api.moreover.com/ping http://www.blogdigger.com/RPC2 http://www.blogshares.com/rpc.php http://www.blogsnow.com/ping http://www.blogstreet.com/xrbin/xmlrpc.cgi http://bulkfeeds.net/rpc http://www.newsisfree.com/xmlrpctest.php http://ping.blo.gs/ http://ping.feedburner.com http://ping.syndic8.com/xmlrpc.php http://ping.weblogalot.com/rpc.php http://rpc.blogrolling.com/pinger/ http://rpc.technorati.com/rpc/ping http://rpc.weblogs.com/RPC2 http://www.feedsubmitter.com http://blo.gs/ping.php http://www.pingerati.net http://www.pingmyblog.com http://geourl.org/ping http://ipings.com http://www.weblogalot.com/ping
A warning though, every time you update a post, a ping is sent to each of these services. So if you’re only making minor changes, and updating many posts per day, these services will actually lower your rankings if they think you’re trying to abuse them.
If you’re only editing or publishing posts daily, or less often, adding more ping services may help increase your exposure.