You dont have to ping your posts.... Wordpress automatically pings it for you when you edit a post or publish a new one
I have created a blog in blogger.com and published my posts. Is it possible to ping my posts which i have published in blogger.com? what should I do to wordpress ping my posts?
Ping is the time (in milliseconds) that it takes to transfer data to and from the server. If your on a low bandwidth line or your far away from the server your ping will be higher.
you need to use free ping service if you use blogspot. search in google with this word "free ping service" or if you use wordpress, everything go perfect it has it's buildin plugin. so dont worry.